E-72 power unit service manual

E-72 power unit service manual
FORM NO. 1-1047
January 2012
E-72
power unit
service manual
Meyer Products LLC
18513 Euclid Ave. • Cleveland, Ohio 44112-1084
Phone 486-1313 (Area Code 216)
www.meyerproducts.com• email [email protected]
© 2012 Printed in the U.S.A.
FOREWARD
This Service Manual includes complete information for servicing the following Electro Lift® Units:
E-72
IMPORTANT: Maintenance and repairs must be performed with the moldboard on the
ground.
The information is grouped according to the type of work being performed, such as diagnosis and
testing, disassembly and reassembly. Special tools and specifications are also included in this manual.
All information, illustrations and product descriptions contained in this manual are correct at publication
time. We do, however, reserve the right to make changes at any time without prior notice.
MEYER PRODUCTS INC.
SECTION INDEX
Section Number
Section Title .....................................................
0
GENERAL INFORMATION AND
MAINTENANCE ........................................................
GENERAL DESCRIPTION AND
THEORY OF OPERATION ........................................
DIAGNOSIS .............................................................
REPAIR PROCEDURE ..............................................
CONTROLLER TROUBLESHOOTING ....................
SPECIFICATIONS .....................................................
1
2
3
4
5
Page
1
4
14
20
43
44
Meyer Products Inc. reserves the right, under its continuing product improvement program, to change construction or
design details, specifications and prices without notice or without incurring any obligation.
SECTION 0
- GENERAL INFORMATION AND MAINTENANCE
CONTENTS
GENERAL INFORMATION ..................................................
2
•
MODEL IDENTIFICATION ....................................................
2
•
MODEL IDENTIFICATION AND
SERIAL NUMBER LOCATION ..............................................
2
•
MOTOR IDENTIFICATION ...................................................
2
MAINTENANCE ...................................................................
2
•
GENERAL MAINTENANCE ...................................................
2
•
CLEANLINESS .................................................................
2
•
VEHICLE ELECTRICAL SYSTEM ...........................................
2
•
CHECK REGULARLY ........................................................
2
POST-SEASON MAINTENANCE ...........................................
2
•
MEYER HYDRAULIC FLUID M-1 .........................................
2
•
REPLACEMENT OF HYDRAULIC FLUID ...................................
3
•
FILTERS ........................................................................
3
PROTECTION AGAINST RUST
CORROSION ............................................................
3
•
AND
-1-
GENERAL INFORMATION
Model Identification
The E-72 unit is an electrically powered hydraulic
mechanism specifically designed for use with the Meyer
E-Z Mount Plus and Drive Pro Snow Plow systems.
MAINTENANCE
The following maintenance information is intended as
a basic guide for providing the E-72 unit with the proper
service and care. Sustained heavy duty operation or
operating under adverse conditions may necessitate
more frequent servicing.
Model Identification and Serial Number Location
Inclusion of the model number and serial number is
extremely important when writing up warranty claim
forms and product report forms for proper evaluation
and follow up.
General Maintenance
Cleanliness
The greatest enemy to any hydraulic system is dirt or
contamination. Therefore, cleanliness must be stressed
at the time of installation, servicing and repairing.
The basic model number is located on the name
plate (plastic cover). The serial number is located
on the name plate decal underneath the plastic cover.
Vehicle Electrical System
Maximum performance and efficiency of the Electro
Lift® unit requires that the vehicle’s electrical system
be properly maintained and consist of:
Battery ----------Alternator ------
70 Amp. Hr. Minimum or
550 Cold Cranking Amps.
60 Amp. Minimum
Check Regularly
1. Battery Terminals - Must be clean and free of
corrosion.
2. Electrical Connections - Must be free of corrosion
and tight.
3. Battery - Must be in first-class condition.
4. Alternator (or Generator) and Regulator - Must be
functioning to specifications.
5. Hydraulic Fluid Reservoir Level - A significant drop
in hydraulic fluid level indicates a leak which must
be located and corrected. Insufficient hydraulic fluid
may result in severe damage.
POST-SEASON MAINTENANCE
Meyer Hydraulic Fluid M-1.
Meyer Hydraulic Fluid M-1 is a specially formulated
mineral oil which maintains an almost constant
viscosity from normal to sub-zero temperatures.
Because it remains free flowing at extremely low
temperatures, the performance and efficiency are not
affected.
Meyer Hydraulic Fluid M-1 also contains an additive
which neutralizes moisture accumulating in the fluid
due to condensation. It is effective for a maximum of
one year’s use.
Meyer Products Inc. will not be liable for damages
resulting from the use of inferior or other fluids or
oils.
-2-
FIGURE 0-1
Replacement of Hydraulic Fluid
After a season’s use, completely drain the hydraulic
fluid (including hydraulic fluid in hoses and
cylinders). Drain fluid through drain plug shown in
Figure 0-1. Disconnect the fittings at the Angling and
Lift cylinders and completely retract the cylinder rods
and purge cylinders and hoses of all hydraulic fluid.
Flush the complete system including unit, hoses and
angling rams with the M-2 Flushing Fluid, or a non
wax (Napthenic) cleaner. If kerosene (Parrafinic) is used
to flush the system, the system must be flushed again
to remove any kerosene with M-2 Flushing Fluid, or a
(Napthenic) based cleaner that is wax free.
Refill E-72 unit with M-1 Fluid by fully retracting lift rod
(Ram) and filling reservoir to the fill mark on the side
of the reservoir. Fill and bleed hoses and Power Angling
cylinders by loosening hydraulic fittings at cylinders
until they leak. Power angle plow repeatedly from one
side to the other until fluid flows steadily from the
leaking fittings while maintaining a constant check on
the reservoir fluid level.
Raise and lower the plow several times and with lift
rod fully retracted, give a final check to the fluid
level and replace filler plug.
Filler Plug
Protection Against Rust and Corrosion
When the E-72 unit is not used for extended periods,
protect the chromed lift rod (Ram) by fully extending
it and coating it with chassis lubricant. Full extension
of the lift rod (Ram) fills the cylinder with hydraulic
fluid. Coat the exposed portions of the Power Angling
cylinder rods (Rams) with chassis lubricant to protect
them against rust and corrosion.
Drain Plug
-3-
SECTION 1
- GENERAL DESCRIPTION AND THEORY OF OPERATION
CONTENTS
GENERAL DESCRIPTION .................................................................................................
5
THEORY OF OPERATION .................................................................................................
5
•
FUNCTIONS ..................................................................................................................
5
•
ELECTRICAL AND FLOW CHARTS ......................................................................................
6-9
ELECTRO LIFT® UNIT COMPONENTS .........................................................................
9
MOTORS ......................................................................................................................
9
•• Iskra ....................................................................................................................
9
•
HYDRAULIC PUMP ..........................................................................................................
9
•
PRESSURE RELIEF VALVE ................................................................................................
9
•
SOLENOID VALVES ......................................................................................................... 9-10
•
•• Cartridge ............................................................................................................ 9-10
•• Coil ...................................................................................................................... 9-10
“A” Solenoid Valve .............................................................................................
11
“B” Solenoid Valve ............................................................................................
11
“C” Solenoid Valve ...........................................................................................
11
•
CHECK VALVES ..............................................................................................................
11
•
PILOT CHECK VALVE ......................................................................................................
11
•
CROSSOVER RELIEF VALVES ............................................................................................
12
•
SOLENOID SWITCH ........................................................................................................
12
•
FILTERS .......................................................................................................................
12
-4-
GENERAL DESCRIPTION
E-72 unit is an electrically powered and electrically
controlled hydraulic mechanism specifically designed
for use with Meyer Snow Plows. The E-72 raises and
lowers the plow with a remote 8" stroke hydraulic lift
cylinder.
In addition to raising and lowering the plow
hydraulically, the E-72 angles the plow hydraulically,
left and right, via remote hydraulic cylinders.
The Electro Lift® unit consists of a specially designed
high torque 12-volt DC motor which is directly coupled
to a gear-type hydraulic pump. The pump obtains its
supply of hydraulic fluid from an integral reservoir which
totally surrounds the integral hydraulic cylinder which
raises and lowers the plow.
The E-72 includes an integral valve body which contains
three electrically controlled solenoid valve cartridges.
Solenoid valve cartridge “A” which is energized to allow
the plow to lower by gravity. Solenoid valve cartridge
“B” is energized to route the pressurized hydraulic fluid
to the remote hydraulic lift cylinder to raise the plow.
Solenoid valve cartridge “C” is energized to route the
pressurized hydraulic fluid to the left remote hydraulic
cylinder to angle the plow to the right. When all
cartridge are not energized and the motor is running
the pressurized hydraulic fluid will flow to the right
remote hydraulic cylinder to angle the plow to the left.
Additional components which control and supply
electrical current to the E-72 units are an operator
controlled Pistol Grip controller; a solenoid switch to
supply high amperage current to the unit’s motor
(motor solenoid); valve cartridge(s); and short heavy
gauge cables to distribute high amperage current
directly from the positive terminal of the vehicle’s
battery and ground the unit directly to the negative
terminal of the vehicle’s battery.
THEORY OF OPERATION
FUNCTIONS
Refer to Figures 1-1 through 1-4 (pages 6 thru 9) for
electrical and hydraulic flow chart for each function.
Each figure explains which component is actuated and
related in each function.
The E-72 four basic functions performed are:
• Raise snow plow
• Lower snow plow
• Angle snow plow to right
• Angle snow plow to left
-5-
FIGURE 1-1
-6-
Reservoir
STRAINER
PUMP
RAISE
LIFT
CYLINDER
PRESSURE RELIEF VALVE
ADJUSTABLE
OPENS at 2000 + 50 P.S.I.
PUMP
CHECK VALVE
RETURN TO
RESERVOIR
A
LOWER
ADJUSTMENT
NOT
ENERGIZED
B
ENERGIZED
C
DUAL
PILOT
CHECK
NOT
ENERGIZED
POWER ANGLING
CYLINDERS
POWER ANGLING
CYLINDERS
CROSS-OVER
RELIEF VALVE
3800 + 400 P.S.I.
E-72 Raise, Motor and “B” Solenoid
FIGURE 1-2
-7-
Reservoir
STRAINER
PUMP
LOWER
LIFT
CYLINDER
PRESSURE RELIEF VALVE
ADJUSTABLE
OPENS at 2000 + 50 P.S.I.
PUMP
CHECK VALVE
RETURN TO
RESERVOIR
A
LOWER
ADJUSTMENT
ENERGIZED
B
NOT
ENERGIZED
C
DUAL
PILOT
CHECK
NOT
ENERGIZED
E-72 Lower, “A” Solenoid
POWER ANGLING
CYLINDERS
CROSS-OVER
RELIEF VALVE
3800 + 400 P.S.I.
POWER ANGLING
CYLINDERS
-8-
Reservoir
STRAINER
PUMP
LIFT
CYLINDER
ANGLE LEFT
FIGURE 1-3
PRESSURE RELIEF VALVE
ADJUSTABLE
OPENS at 2000 + 50 P.S.I.
PUMP
CHECK VALVE
RETURN TO
RESERVOIR
A
LOWER
ADJUSTMENT
NOT
ENERGIZED
B
NOT
ENERGIZED
C
DUAL
PILOT
CHECK
NOT
ENERGIZED
E-72 Angle Left, Motor only
POWER ANGLING
CYLINDERS
CROSS-OVER
RELIEF VALVE
3800 + 400 P.S.I.
POWER ANGLING
CYLINDERS
-9-
Reservoir
STRAINER
PUMP
LIFT
CYLINDER
PRESSURE RELIEF VALVE
NON ADJUSTABLE
OPENS at 2000 + 50 P.S.I.
PUMP
CHECK VALVE
RETURN TO
RESERVOIR
A
LOWER
ADJUSTMENT
NOT
ENERGIZED
B
NOT
ENERGIZED
C
DUAL
PILOT
CHECK
ENERGIZED
POWER ANGLING
CYLINDERS
POWER ANGLING
CYLINDERS
CROSS-OVER
RELIEF VALVE
3800 + 400 P.S.I.
E-72 Angle Right, Motor and “C” Solenoid
ANGLE RIGHT
FIGURE 1-4
ELECTRO LIFT® UNIT COMPONENTS
E-72 UNIT COMPONENTS
direction by the valve spring, the poppet valve will
open. This allows some of the pressurized hydraulic
fluid to flow through the connecting passage to the
non pressurized inlet passage. The effect is to lower
the pressure in the outlet passage which will allow the
valve spring to close the poppet valve again.
MOTOR (4-1/2”)
Monarch - Two terminal
The Monarch motor is a four pole, electromagnet motor
which consists primarily of a 4-1/2" diameter solid steel
frame, armature, brushes, field coils and pole pieces.
This motor can be used on vehicles with either the
common negative ground electrical system or the
positive ground electrical system.
OUTLET PORT
POPPET
VALVE
VALVE
SPRING
HYDRAULIC PUMP
PUMP HOUSING
The pump in a hydraulic system employs an external
source of power to apply a force to a liquid. A pump
develops no power of its own. It simply transfers power
from an external source (the electric motor on the
E-72) to the liquid in the hydraulic system.
INLET PORT
FIGURE 1-6
The basic operating principles of the hydraulic pump
used in the E-72 units are quite simple. Figure 1-5
illustrates the basic components of a positive
displacement gear type pump and their functions. The
pumping action takes place within the pump chamber
which is connected to the reservoir by the intake line.
The pump chamber has an outlet line in which the liquid
under motion and pressure leaves the pump to perform
work.
Under a condition, such as when a hydraulic
cylinder is extended to the end of its stroke,
eliminating additional space for the pressurized
hydraulic oil to be pumped into, the alternate
opening and closing of the poppet valve controls
the pump’s pressure output and provides an escape
for the pressurized hydraulic fluid.
The pressure relief valve used in the E-72 hydraulic
unit, while more sophisticated than the one described,
functions in the same manner. The pump pressure relief
valve may be adjusted to the specified pressure of
2000 P.S.I. by adjusting the set screw after installing a
suitable pressure gauge of 2500 P.S.I. in the circuit.
RESERVOIR
SOLENOID VALVES
Hydraulic valves are simple in concept and all have
the same basic function: Control the direction of oil
flow.
ELECTRIC
MOTOR
O
FL
W
INTAKE LINE
DRIVEN GEAR
W
O
FL
PUMP CHAMBER
Each Solenoid Valve consists of two components:
the Cartridge and the Coil.
DRIVE GEAR
Cartridge
OUTLET LINE
The Cartridge consists of the hydraulic valve
mechanism and an armature which enables the
valve mechanism to be operated and controlled
electrically. The Cartridge is designed to screw in
and out of the E-72 units much like the typical
“spark plug”.
PUMP HOUSING
FIGURE 1-5
PRESSURE RELIEF VALVE
A basic pressure relief valve is shown in
Figure 1-6. It consists of a poppet valve and a valve
spring. Both are located in a passage which connects
the inlet passage to the outlet passage. The poppet
valve is normally held closed by the valve spring,
sealing the connecting passage from the pressurized
outlet passage. The poppet valve, being a piston, is
exposed to the pressurized hydraulic fluid in the outlet
passage. Whenever the hydraulic pressure against the
poppet valve becomes greater than the pressure being
exerted on the poppet valve from the opposite
Coil
WINDING
COIL
VALVE SPOOL
ARMATURE
-10-
FIGURE 1-7
ELECTRO LIFT® UNIT COMPONENTS CONT.
The Coil is the electrical component which operates
the Cartridge’s valve mechanism by producing
magnetism which pulls the Cartridge’s armature
toward it. Since the armature is connected to the
valve mechanism’s only moving part, it is pulled
by the armature.
“C” Solenoid Valve E-72
The “C” Solenoid valve is used on the E-72 hydraulic
unit for power angling. The “C” Cartridge contains a
spool valve whose static (de-energized) position allows
the pressurized hydraulic fluid to flow to the right power
angling cylinder which angles the plow to the left. At
the same time, it allows the hydraulic fluid being forced
from the retracting left power angling cylinder to flow
through the “C” Cartridge back to the reservoir.
Figure 1-7 illustrates the typical Coil. Whenever
electrical current flows to the Coil, it flows
through the winding, which consists of
numerous turns of copper wire. The flow of
current through the winding produces a
magnetic field which pulls the soft iron armature
further into the Coil.
In the energized position, the pressurized hydraulic
fluid is diverted to the left power angling cylinder,
angling the plow to the right. Also, the hydraulic fluid
being forced from the retracting right power angling
cylinder flows through the “C” Cartridge back to the
reservoir.
The armature pulls the valve spool or poppet
valve into its alternate (energized) position. Not
illustrated is an integral coil spring, which is
compressed when the armature is pulled by the
magnetism.
CHECK VALVES
Check valves are very simple devices that have two
basic functions: They prevent fluid from passing through
them in one direction, but they allow fluid to pass
through them in the opposite direction.
When the current flow ceases, the magnetic field
disappears and the compressed coil spring
pushes the armature back to its original
(de-energized) position.
In the E-72 a pump check valve is used to prevent
hydraulic fluid from leaking back through the pump to
the reservoir.
“A” Solenoid Valve E-72
The “A” Cartridge contains a poppet valve whose static
or de-energized position is closed. Its energized
position is open.
The E-72 unit uses one check valve located between
the “B” Solenoid Valve and the lift cylinder. It prevents
the hydraulic fluid in the lift cylinder from leaking back
through the “B” Solenoid Valve which could cause the
plow to drift down.
The “A” Solenoid Valve retains hydraulic fluid in the
lift cylinder. It is energized (opened) to allow the
hydraulic fluid to flow from the lift cylinder back to
the reservoir, enabling the plow to lower by gravity.
DOUBLE ACTING PILOT CHECK VALVE
The “A” Solenoid Valve is designed to remain
energized (open) while the plow is lowered, plowing
snow. This is the “float” feature which insures that
the plow maintains contact with the ground contour.
The pilot check valve is more sophisticated in that it
incorporates a piston in addition to the ball, seat and
spring. It is located next to the “C” valve on the E-72.
It has two functions: The first is to prevent the hydraulic
fluid in either power angling cylinder from leaking back
to the reservoir. The second is to allow the hydraulic
fluid from the retracting power angling cylinder during
the angling cycle to return to the reservoir. This is
accomplished by the pressurized hydraulic fluid
moving the piston which forces the check ball off its
seat.
“B” Solenoid Valve E-72
The “B” Cartridge contains a poppet valve whose
static or de-energized position is closed. Its energized
position is open.
The “B” Cartridge contains a spool valve whose
(energized) position allows the pressurized hydraulic
fluid to flow to the lift cylinder, raising the plow.
The “B” Cartridge de-energized position retains the
hydraulic fluid in the lift cylinder, holding the plow
up.
-11-
ELECTRO LIFT® UNIT COMPONENTS CONT.
CROSSOVER RELIEF VALVE
With this system, the hydraulic fluid is filtered as it
leaves the reservoir on its way to the pump and on the
Power Angling units.
When plowing snow, a snow plow can be exposed to
damaging forces caused by impact with hidden
obstructions, ends of curbs, etc. With power angling,
these damaging forces can damage not only the snow
plow but also the vehicle. The crossover relief valve
has the function of protecting the snow plow system
against these damaging forces under normal snow
plowing conditions. The crossover relief valve, cannot
protect the system from damaging forces that are too
great due to abusive snow plowing conditions.
IMPORTANT:
Should the hydraulic fluid become contaminated, it
will be necessary to replace all the hydraulic oil in the
system. The complete system (hydraulic unit, power
angling cylinders, mount cylinder and hoses) should
be flushed. Flush the system with Meyer Hydra-Flush™
Fluid M-2.
Basically, the crossover relief valve functions exactly
like the previously described pump relief valve. It’s
designed to open at a specific pressure.
In this instance, the pressure is not produced by
the pump but rather by the damaging force. As an
example, assume that the right corner of the plow
runs into the end of a curb. The impact will attempt
to collapse the right power angling cylinder. As a
result, very high hydraulic pressure is produced
within the cylinder. When the produced pressure is
high enough, it opens the crossover relief valve,
allowing the highly pressurized hydraulic fluid to flow
directly to the left power angling cylinder.
When the crossover relief valve functions in this manner,
the excessive pressure is released, the excessive energy
produced by the impact is absorbed, and the result is
only a change in angled position of the plow.
The crossover relief valve is factory set to the specified
pressure of 3000 P.S.I. this setting is adjustable.
SOLENOID SWITCH
The E-72 motor requires more current or amperage to
operate than the vehicle wiring, vehicle ignition switch
or toggle switches have the capacity to handle. The
solenoid switch is essentially a heavy duty switch with
the capacity to handle the heavy current required by
the motor. It is closed electrically by the solenoid to
convey the heavy current directly from the vehicle
battery via heavy gauge electrical cable. The solenoid,
which functions essentially the same as the previously
described solenoid valves, receives its low amperage
current at the proper times via the wiring harness. This
solenoid must be grounded to operate properly.
STRAINER
Cleanliness is perhaps the single most important
ingredient in assuring a hydraulic system’s reliability.
Should the hydraulic fluid become contaminated,
malfunction and permanent damage to the hydraulic
system may occur. For this reason, all the E-72 units
are equipped with a Strainer on the pump pick up
tube.
-12-
SECTION 2 - DIAGNOSIS
CONTENTS
E-72
GENERAL INFORMATION
14
TESTING TIPS
14
“RAISE” Troubleshooting
15
“LEAK DOWN” Troubleshooting
16
“LOWER” Troubleshooting
16
“ANGLE LEFT” Troubleshooting
17
“ANGLE RIGHT” Troubleshooting
18
“WILL NOT HOLD ANGLE” Troubleshooting
18
Wiring Information
19
-13-
DIAGNOSTIC FLOW CHART FOR
E-72 Unit
These charts are intended to be used as an aid in diagnosing problems on the E-72 unit. They are not a substitute for factory training and
experience. Be certain to read the General Information and Testing Tips sections before attempting any troubleshooting.
IMPORTANT: Maintenance and repairs must be performed with the moldboard on the ground.
General Information
1.
2.
3.
Before any troubleshooting is started, make certain the following conditions are met.
The moldboard is pointing straight ahead. This can often be done by coupling the left cylinder into the right cylinder and
pushing the moldboard by hand.
The power angling cylinders must be installed correctly on to the plow assembly. The left cylinder (Driver’s side) has a hose
attached with a female half of a coupler at the end; the right cylinder (Passenger side) has a hose attached with a male half
of a coupler at the end.
The solenoid wires must be on their proper coil. The “A” coil (black and tan wires) on power angling block labeled “BLK”. The
“B” coil (red and tan wires) on power angling block labeled “RED”. The “C” coil (green and tan wires) on power angling
block labeled “GRN”.
TESTING TIPS
Many tests do not require removing the Electro Lift® unit from the vehicle. However, more thorough testing can be
performed using the Meyer Test Stand which allows direct pressure and amperage readings.
1. Using a screwdriver or other small tool to check for magnetism of the solenoid coils “A”, “B” and “C”. Place the tool on the nut
securing the coil and have an assistant operate the switch. You should feel strong magnetic attraction.
2. Use a test light or volt meter to determine whether there is power at the harness.
3. When determining AMP draw of the motor, always obtain the highest value possible, i.e, at maximum raise or maximum
angle with motor running.
4. The pump shaft of a good pump can be turned smoothly using two fingers. If it can’t be turn easily, the pump is too tight and must
be replaced.
5. Pump pressure can be measured at an angle hose (note pressure at full angle).
6. Flush the complete system including unit, hoses and power angling rams with Meyer Hydra-Flush™ Fluid M-2.
The controller is self diagnosing. The monitor light is located in the upper left corner next to the float light of the control switch. When the
monitor light turns on and begins to flash the control switch is sensing a problem with a specific coil/connection on the hydraulic unit.
The label below is on the back side of your control switch. Reset is accomplished by turning off the ignition switch or by turning the
power switch off momentarily and then back on. If the monitor light is still illuminated after attempts to reset the switch have failed,
contact your nearest authorized Meyer Distributor for repairs.
-14-
E-72
SNOW PLOW WILL NOT RAISE
NO
Does the Motor
Operate?
Is there power
going to
the motor?
Are all electrical
connections clean
and tight?
Is Battery Charged?
NO
YES
Charge Battery Clean and tighten
all electrical
Connections.
YES
Remove motor.
Does motor run when
12 volts is applied?
NO
Inspect Motor Armature, Brushes
Repair or Replace
Motor as necessary
NO
YES
YES
NO
Can the pump
shaft turn by
hand?
NO
YES
Is Ground Cable
attached to the
Negative (-)
Battery Terminal?
Is there power
leaving the
switch?
Check switch
for Continuity
NO
Is there power
going to the
motor solenoid,
at White Wire?
Check Wires at
Molded connector.
YES
YES
Replace the
Wiring
Harness.
Replace the
Motor
Solenoid.
YES
NO
Is the Fuse
OK?
NO
YES
Replace pump.
Replace the
Is the fluid level
1-1/2" below
filler hole?
NO
Controller
ADD M-1
Fluid
YES
Does the snow plow
angle to the left
instead of raising?
NO
Does the snow plow
angle when the
Angle Switch
is activated?
NO
Is there pressure
(or flow) at the
raise port?
NO
Replace
the
Pump.
YES
YES
Is the "A" Valve
stuck in the
open position?
YES
YES
Clean or Replace
"A" Valve.
-Retest Does snow plow
raise?
NO
Can pump relief
pressure be adjusted
to 2000 P.S.I.
Is the pump
shaft turning
tightly?
NO
Does the motor
armature turn
tightly?
YES
YES
Replace
the
Pump.
NO
Does the "B" Coil
(Red Wire) have
magnetism?
NO
NO
Replace
O-Rings.
Is there power
leaving the switch
at the red wire?
YES
YES
YES
Are the "B" Valve
O-Rings in good
Condition?
Is there power to
the "B" Coil?
(Red Wire)
at Harness
Replace
the wiring
harness.
Replace
"B" Coil.
YES
Clean or
Replace the
"B" Valve
and retest.
-15-
NO
Repair or Replace
the motor.
Are wires in
molded connector
making contact
with the switch?
YES
Replace
Controller
Replace Fuse.
Check for short
in Harness,
"B" Coil, Switch
Connections,
Motor Solenoid,
Electric Motor.
E-72
SNOW PLOW LEAKS DOWN
Does the
snow plow drop
straight down?
NO
Does the snow plow
drop and angle
to the left?
YES
YES
Are "A" Valve O-rings
in good condition?
Does "A" Valve stem
move freely?
Replace
"B" Check Valve
Does it now hold?
NO
NO
Replace
"B" Valve
Replace O-Rings
Replace "A" Valve
YES
Replace Lift Cylinder
SNOW PLOW WILL NOT LOWER
Does "A" Coil
(Black Wire) have
magnetism?
NO
Is there power to the
"A" Coil (Black Wire)
at harness?
NO
YES
YES
YES
Is there power leaving
the switch at the
Black Wire?
Replace
"A" Coil
Replace
Harness
NO
Is the Controller
plugged in completely?
YES
Is Fuse
OK?
YES
Replace "A" Valve
Does it now lower?
NO
Check for a clogged
filter or a blocked
passageway.
(Lower Adj. Screw)
NO
Check for Bent or
Siezed Ram
Assembly.
-16-
Replace
Controller
NO
Replace the fuse Check for short in
harness, "A" Coil,
Plug connections.
E-72
SNOW PLOW WILL NOT ANGLE LEFT
NO
Can the snow plow
Raise?
See the Raise
Flow Chart
Section
YES
Does the motor run
when angle switch
is pushed?
NO
Is there power to
the motor solenoid?
(White Wire)
NO
NO
Is there power
leaving the switch?
Is the switch
plugged in completely
YES
YES
YES
Does the snow plow
raise instead of
angling left?
YES
Clean or replace the
"B" Valve.
Retest
Replace
controller
Replace Harness
NO
Does the snow plow
angle to the right
the angle left
switch is pushed?
NO
YES
Clean or replace the
"C" Valve.
Retest
Is the ampere draw
less than 100 amps
while trying to angle
snow plow?
NO
YES
NO
Is the Pilot piston in
good condition?
(worn/sloppy or missing)
Relieve the interference
between the
Sector and A-Frame.
YES
NO
Replace
Piston
YES
Are "C" Valve
O-Rings in good
condition?
NO
Can the snow plow be
angled by hand when the
P.A. Rams are disconnected
from A-Frame?
Will the snow plow angle
right & left if not allowed
to travel to extreme
angled position?
NO
Does pressure remain
in angle hose
when the motor
is not running?
YES
NO
Replace
O-Rings
YES
YES
Clean or replace
the Crossover Relief.
If both hoses are stiff
inspect the Pilot Check
Piston and "C" Valve
for binding.
Temporarily put 1/2" blocks
between the Sector and
A-Frame to limit the degree
of angle. Will the snow plow
now angle?
YES
Weld
1-1/2" x 1-1/2" x 1/2"
spacers to the A-Frame
stops.
-17-
If one hose is stiff
inspect the the "C"
valve for binding.
NO
Clean or replace the
"C" Valve.
E-72
SNOW PLOW WILL NOT ANGLE RIGHT
Can the snow plow
Raise?
NO
See the Raise
Flow Chart
Section
YES
Does the motor run
when angle switch
is pushed?
NO
Is there power to
the motor solenoid?
(White Wire)
NO
Is there power
leaving the switch?
Are the wires in
molded connector
making contact with
the switch?
NO
YES
YES
YES
Replace
Controller
Replace Harness
Does the snow plow
raise instead of
angling left?
NO
Can the snow plow
angle to the Left?
YES
YES
Clean or replace the
"B" Valve.
Retest
Does the "C" Coil
have magnetism?
(Green Wire)
NO
Is there power to
the "C" Coil?
(Green wire at harness)
NO
YES
YES
YES
Replace the
"C" Coil.
Retest
Are "C" Valve
O-Rings in good
condition?
NO
Is there power
leaving the switch?
Replace Harness
NO
Are the wires in
molded connector
making contact with
the switch?
YES
Replace
Controller
Replace
O-Rings
YES
Clean or replace
the Crossover Relief.
Does the snow plow
now angle?
Clean or replace the
"C" Valve.
SNOW PLOW WILL NOT HOLD ANGLE
Are the Rams mushy?
Can you push the moldboard
6" to 8" by hand?
NO
Does the moldboard
hold left angle & release
from right angle?
NO
Change Pilot Check
does snowplow
now hold?
YES
Bleed air from the system
and snug up gland nuts.
Check fittings for leaks.
YES
Change Pilot Check
does snowplow
now hold?
NO
Inspect Crossover Relief.
(Rebuild or Replace)
-18-
NO
Replace Crossover.
E-72 Wiring
Red
"C"
White
NE
PO
"A" "B"
Black
G
S
BA
TT
E
RY
Black Ground
Blue (Reverse
Signal)
"C" Harness
To Plow Light
"A"
Light
Adapter
Orange to "B"
harness of light modules
"B" Harness
Power/Ground
Park &Turn
See page 38 for diode wiring on motor solenoid
"C" Green Wire
"A" Black Wire
"B" Red Wire
Lift Cylinder
Driver
Side (LH)
Passenger
Side (RH)
-19-
SECTION 3 -
REPAIR PROCEDURES
CONTENTS
GENERAL INFORMATION ...........................................
21
UNIT DISASSEMBLY AND REASSEMBLY .................
21
Disassembly .............................................................
21
Reassembly ..............................................................
21
• Additional Reassembly Points ............................
21
PUMP ...............................................................................
21
Shaft Seal Replacement .........................................
21
E-72 ELECTRO LIFT ® .........................................................................................
Exploded View .........................................................
22
Parts Breakdown .....................................................
23
Disassembly Photos ................................................
24-33
Reassembly Photos .................................................
34-37
CONTROLLER OPERATION ........................................
38
SPECIFICATIONS .........................................................
39
-20-
GENERAL INFORMATION
Using the proper guidelines and precautions, the
E-72 units are easy to disassemble and reassemble.
Figure 3-1 is an exploded view which applies to the
E-72. It should be used as the primary reference for
proper reassembly. Where necessary, this section
includes additional information, photographs and
illustrations to assure proper and efficient repairs.
UNIT DISASSEMBLY AND REASSEMBLY
Many repair procedures, including removal and
replacement of the “A”, “B” and “C” Solenoid Valves,
can be accomplished without removing the unit from
the vehicle. While Figures 3-2 through 3-76 show the
unit clamped in a vise, make all possible repairs on
the vehicle when possible.
NOTE: Pump Assembly should not be disassembled
since it cannot be serviced.
Disassembly
See Figures 3-2 through 3-45 (pages 24-34).
Reassembly
See Figures 3-46 through 3-76 (pages 35-42) for
important reassembly points.
Additional Reassembly Points
O-Rings-
Coat liberally with hydraulic fluid and
position carefully to minimize possibility
of damage during assembly.
Fasteners- Torque all fasteners which are specified to
insure proper reliability and prevent
damage due to over-tightening.
PUMP
Shaft Seal Replacement
NOTE: Do not disassemble pump assembly.
1.
Remove motor and Pump assembliesas shown in
Figures 3-31 thru 3-44 (pages 31-34).
2.
Using an appropriate tool, pry out the original shaft
seal, being careful not to damage the shaft or pump
housing.
-21-
3.
Liberally coat the replacement seal I.D. with
hydraulic fluid and apply a very light film of
Permatex Form-A-Gasket No. 2 or equivalent to
the replacement seal O.D.
4.
Carefully slide the replacement seal
over the shaft until it is squarely against the pump
housing.
5.
Replace the motor and pump assemblies as
shown in Figures 3-47 & 3-55 (page 35-37).
14
E-72
Exploded View
16
17
18
FIGURE 3-1
11
13
12
1
23
7
13
19
21
13
22
15
14
2
9
3
23
8
20
10
-22-
4
6
5
PARTS BREAKDOWN
PARTS LIST
ITEM
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
E-72 12V E-72 24V QTY DESCRIPTION
16006 16007
1 Lift Assembly (Unit Only)
15096 15154
1 • Motor (2 Terminal)
15097 15097
1 • Pump Assembly
15083 15083
4 • Allen Head Screw 1/4-20 x 3"
15101 15101
1 • Pump Filter Assy.
15169 15169
1 • Reservoir
15066 15069
1 • Reservoir Clamp
15067 15067
1 • Reservoir Breather
15100 15100
1 • Oil Pick up Tube 5-3/4"
15099 15099
1 • Oil Return Tube 8"
15180 15180
1 • Oil Return Tube 8"
15175 15170
1 • Base Assembly
15121 15121
1 • Adjustable Relief Valve
15082 15082
1 • Seal Kit (All Seals)
15150 15157
3 • Coil (12V)
15146 15146
1 • "A" Cartridge Valve
15117 15117
1 • "B" Cartridge Valve
15111 15111
1 • "C" Cartridge Valve
15165 15165
1 • Kit Needle Valve (Lower Adj.)
15148 15148
1 • Kit Dual PO Check Valve
15152 15152
1 • Kit Check Valve Assembly
15179 15179
1 • Kit Relief Valve Assy. 3000 p.s.i.
22866 22866
1 • 90 degree elbow fitting
22868 22868
2 • Straight Fitting
Parts indented are included in assembly under which they are indented.
-23-
DISASSEMBLY
FIGURE 3-2
FIGURE 3-3
To drain oil from the unit, remove the fill plug and drain
plug.
Use a 3/4” wrench to loosen and remove “A” Coil.
FIGURE 3-4
FIGURE 3-5
Remove “A” Coil.
Use a 7/8” wrench to loosen and remove “A” Valve.
-24-
DISASSEMBLY
FIGURE 3-6
FIGURE 3-7
Remove “A” Valve. Clean by soaking cartridge in cleaning
solvent.
Use a 3/4” wrench to loosen and remove “B” Coil.
FIGURE 3-8
FIGURE 3-9
Remove “B” Coil.
Use a 7/8” wrench to loosen and remove “B” Valve.
-25-
DISASSEMBLY
FIGURE 3-10
FIGURE 3-11
The “B” Cartridge is removed. Clean by soaking
cartridge in cleaning solvent.
Use a 3/4” wrench to loosen and remove “C” Coil.
FIGURE 3-12
FIGURE 3-13
Remove “C” Coil.
Use a 7/8” wrench to loosen and remove “C” Valve.
-26-
DISASSEMBLY
FIGURE 3-14
FIGURE 3-15
The “C” Cartridge is removed. Clean by soaking
cartridge in cleaning solvent.
Use a 11/16” wrench to remove the Lower Adjustment
Assembly.
FIGURE 3-16
FIGURE 3-17
Remove Lower Adjustment Assembly.
Remove hydraulic Breather.
-27-
DISASSEMBLY
FIGURE 3-18
FIGURE 3-19
Use a 7/8” wrench or socket to loosen and remove Pilot
Check Valve Assembly.
Remove Pilot Check Valve Assembly. Clean by soaking
Assembly in cleaning solvent. Do not take apart.
FIGURE 3-20
Use a 7/8” wrench to loosen and remove Cross-over
Relief Valve. The Cross-over Relief Valve is factory set
at 3000 P.S.I. It is adjustable by removing the cap and
inserting an allen wrench to turn clockwise to raise the
pressure and counter clockwise to lower the pressure.
FIGURE 3-21
Remove Cross-over Relief Valve.
-28-
DISASSEMBLY
FIGURE 3-22
FIGURE 3-23
Use a allen wrench to loosen and remove “B” check
valve plug.
Remove “B Check Valve plug.
FIGURE 3-24
FIGURE 3-25
Remove “B Check Valve spring.
Remove “B Check Valve poppet.
-29-
DISASSEMBLY
FIGURE 3-26
FIGURE 3-27
Loosen jam nut on pump pressure relief valve.
Loosen and remove pump pressure relief valve with an
allen wrench.
FIGURE 3-28
FIGURE 3-29
Remove pump pressure relief valve adjuster.
Remove pump pressure relief valve spring.
-30-
DISASSEMBLY
FIGURE 3-30
FIGURE 3-31
Remove pump pressure relief valveball.
To replace the motor remove the two cap screws, use a
7/16” wrench.
FIGURE 3-32
FIGURE 3-33
Hold the motor parts together while removing it from the
pump base.
Use a screwdriver to loosen reservoir clamp and remove
clamp.
-31-
DISASSEMBLY
FIGURE 3-34
FIGURE 3-35
Remove Reservoir from Base. Clean reservoir with hot
soap and water.
Carefully loosen and remove plastic oil return tubes.
FIGURE 3-36
FIGURE 3-37
Remove plastic oil return tubes.
Slide Strainer off pump pick up tube.
-32-
DISASSEMBLY
FIGURE 3-38
FIGURE 3-39
Carefully loosen and remove plastic oil pick up tube.
Remove plastic oil pick up tube.
FIGURE 3-40
FIGURE 3-41
Use an allen wrench to loosen and remove the 4 bolts
holding the pump to the base.
Remove the 4 bolts holding the pump to the base.
-33-
DISASSEMBLY
FIGURE 3-43
FIGURE 3-42
Clean base with cleaning solvents and inspect pump
shaft bearing. If bad replace the base.
Remove pump from base.
Before
reassembly, be
sure to have
Meyer seal kit
part number
15170
FIGURE 3-44
FIGURE 3-45
Remove pump shaft seal from opposite side of base
and replace.
Meyer E-72 Seal kit 15170.
-34-
REASSEMBLY
FIGURE 3-46
FIGURE 3-47
Replace pump to base o-ring and re-install pump.
Attach pump to base with 4 allen head bolts.
FIGURE 3-48
FIGURE 3-49
Torque all four pump mounting bolts to 100-125 in. lbs.
be sure to torque in an even pattern.
Re-install oil pick-up tube to pump. Do not overtighten
or use any thread sealant.
-35-
REASSEMBLY
FIGURE 3-50
FIGURE 3-51
Slide strainer onto plastic oil pick-up tube. Do not glue,
this will be held in place by the reservoir.
Re-attch both platic oil return tubes to the base. Do not
use thread sealant and do not over tighten.
FIGURE 3-52
FIGURE 3-53
Replace o-ring on base and install reservoir.
Clamp reservoir to base with reservoir clamp. Do not
use sealant.
-36-
REASSEMBLY
FIGURE 3-54
FIGURE 3-55
Carefully re-install motor to base. Be sure motor shaft
aligns with pump shaft.
Tighten motor mounting bolts to base using a 7/16”
wrench.
FIGURE 3-56
FIGURE 3-57
Re-install pump relief valve ball.
Re-install pump relief valve spring.
-37-
REASSEMBLY
FIGURE 3-58
FIGURE 3-59
Install pump relive valve adjuster. This will be adjusted
when hydraulic unit is back on plow. Put a guage in an
angle hose and extend the angle hose all the way, while
holding the button for angle set pressure to 2000 P.S.I.
(tighten increases and lossening decreases pressure).
Tighten adjuster jam nut after pressure has been set to
2000 P.S.I.
FIGURE 3-60
FIGURE 3-61
Install “B” Check Valve Poppet.
Install “B” Check Valve Spring.
-38-
REASSEMBLY
FIGURE 3-62
FIGURE 3-63
Install “B” Check Valve Cap.
Tighten “B” Check Valve Cap.
FIGURE 3-64
FIGURE 3-65
Re-install Cross-over relief valve. Tighten Cross-over
relief valve. Pressure is adjustable and should be set to
3000 PSI. In order to adjust set a guage in agle ram and
apply pressure to angle system at plow.
Turn in allen screw to raise and out to lower pressure.
Valve should open when 3000 PSI is attained and allows
the plow to angle. This valve enables the plow to absorb
impacts.
-39-
REASSEMBLY
FIGURE 3-66
FIGURE 3-67
Re-install Pilot Check Valve Assembly.
Tighten Pilot Check Valve Assembly.
FIGURE 3-68
FIGURE 3-69
Re-install Breather
Re-install Lower Adjustment Assembly. To adjust drop
speed of the plow turn the knob in for slower and out for
faster drop.
-40-
REASSEMBLY
FIGURE 3-70
FIGURE 3-71
Re-install “C” Valve
Re-install “C” Coil.
FIGURE 3-72
FIGURE 3-73
Re-install “B” Valve.
Re-install “B” Coil.
-41-
REASSEMBLY
FIGURE 3-74
FIGURE 3-75
Re-install “A” Valve.
Re-install “A” Coil.
FIGURE 3-76
Fill Hydraulic Unit with Meyer M-1 Fluid. Flush out hoses,
lift cylinder and both angle cylinders before operating
plow.
-42-
INSTALLATION INSTRUCTIONS
When installing motor solenoid part number 15370 (per form number 1-841) or If motor solenoid is already installed on the vehicle, the enclosed diode part
number 15059, must be connected to the small terminal with white wire of the motor solenoid and to the motor solenoid mounting bracket as shown below.
Note: Motor Solenoid must have a good ground in order to operate properly. The 22717 control adapter shown below is only needed when replacing
a 22154 Touchpad. The orange wire of the adapter can be connected to the orange wire on the back of the plow light switch. The plow light switch could
then be removed along with the black and red wires which were connected to the plow light switch. When the controller is turned on it will activate the snow
plow lights. When the controller is turned off or removed from the harness this will activate the vehicle headlights.
4 Post Motor Solenoid
22717 Adapter
To 22690X Controller
Blue wire to
reverse signal.
HFP (ALM/ARM)
To vehicle harness
On/Off
To orange wire from
plow light switch.
3 Post Motor Solenoid
Imprinted on backside of Controller
Raise
Float
Angle Left
Monitor
Angle Right
Lower
Systems Monitor
LED Read-Out
Light Flashes Check Coil (wire Color)
Continuous Light----Motor Solenoid
1 Light Flash----Red
2 Light Flashes----Black
3 Light Flashes----Green
4 Light Flashes----Yellow
5 Light Flashes----Lt. Blue
6 Light Flashes----Purple
SNOW PLOW CONTROLLER OPERATION
The snow plow should only be in operation when the vehicle ignition switch and the control switch are in the “ON” position. Care should be taken to
insure that the control switch is kept dry and free from moisture during normal operation.
When the control switch is turned “On,” lights illuminate the location of the individual touch pads for the functions of the snow plow: (Up), (Angle Left),
(Angle Right) and (Down).
Lowering of the snow plow an inch at a time is possible by tapping the down arrow in short intervals. Holding down the down arrow will activate a float
light located in the upper right corner of the control switch. This light indicates the snow plow is now in the Lower/Float position. In this position the
snow plow will be able to follow the contour of the road and the snow plow can also be angled to the left or right. Touching the up arrow automatically
cancels the Lower/Float position.
While angling left or right or raising the snow plow if the button is pressed for more than four seconds the operation will be cancelled. This feature
eliminates unnecessary amp draw from the vehicle charging system.
Hands-Free Plowing or ALM/ARM
Meyer re-branded the ALM/ARM feature on its 22690X controllers to be Hands-Free Plowing (HFP) ™. When activated, the
Hands-Free Plowing (HFP) mode uses the vehicle’s shift lever to control the up/down movement of the moldboard. Pressing the
HFP button on the controller will toggle you through: On/Off, Back-drag Mode (default mode when active), and Forward Plowing
Mode.
Back-dragging Mode or ALM
When the controller is on and you are in the conventional plow control mode, pressing the HFP button will activate Hands-Free
Plowing (HFP). The default mode for HFP is the Back-drag Mode. In the Back-drag Mode, the moldboard will automatically lower
when you put the vehicle in reverse. Put the vehicle in drive to automatically raise the moldboard.
Forward Plowing Mode or ARM
To activate the Forward Plowing Mode when HFP is already on, press the HFP button once. The moldboard will automatically lower
when you put the truck into drive. When you reach the end of a run, the moldboard will automatically raise when you put the vehicle
in reverse.
To turn the HFP feature off, press the HFP button until you see the HFP light go off.
This switch is self diagnosing. The monitor light is located in the upper left corner next to the float light of the control switch. When the monitor light
turns on and begins to flash the control switch is sensing a problem with a specific coil/connection on the hydraulic unit. The label below is on the back
side of your control switch.
Reset is accomplished by turning off the ignition switch or by turning the power switch off momentarily and then back on. If the monitor light is still
illuminated after attempts to reset the switch have failed, contact your nearest authorized Meyer Distributor for repairs.
-43-
HYDRAULIC SPECIFICATIONS
ELECTRICAL SPECIFICATIONS
MOTOR
Applied Voltage
Max. Current Draw
12 Volts DC
230 Amperes
SOLENOID VALVES “A”, “B” and “C”
Applied Voltage
12 Volts DC
Current Draw
1.9 Amperes
Nominal resistance (ohm meter lead connected
to coil lead) 8.0 ohms ± 10%.
MOTOR SOLENOID
Applied Voltage
12 Volts DC
Max. Current Draw
5 Amperes
Nominal resistance (ohm meter lead connected to
coil lead, other meter lead connected to metal
foot) 2.65 to 4.5 ohms.
HYDRAULIC SPECIFICATIONS
PUMP - Pressure Output
2000 P.S.I.
CROSSOVER RELIEF VALVE
Opening Pressure
3000 P.S.I.
HYDRAULIC FLUID CAPACITY
NOTE :1 Quart = 32 Fluid Ounces
Model E-72
Unit
1 qt., 4.5 oz.
(36.5 oz.)
Hoses & 1-1/2 x 10 Cylinders
16 oz.
Total
1 qt., 20.5 oz.
(52.5 oz.)
-44-
Notes
-45-
E-72
power unit
service manual
Meyer Products LLC
18513 Euclid Ave. • Cleveland, Ohio 44112-1084
Phone 486-1313 (Area Code 216)
www.meyerproducts.com• email [email protected]
© 2012 Printed in the U.S.A.
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