kr pressurite™ grease gun

kr pressurite™ grease gun
KR PRESSURITE™ GREASE GUN
INSTRUCTION MANUAL
INTRODUCTION
Thank you for purchasing a Macnaught KR PRESSURITE Grease gun . The KR PRESSURITE grease gun has
been designed for use with the Macnaught model K7
Mini-Lube and K4 Super-Lube Manual Greasing
Systems.
Please read and retain this instruction manual to assist
you in the operation and maintenance of this quality
product.
GENERAL INFORMATION
This manual assists you in operating and maintaining your
new KR PRESSURITE grease gun. The information contained in this instruction manual will help you ensure many
years of dependable performance and trouble free operation.
Please take a few moments to read through this manual
before operating your KR grease gun. If you experience
problems with the product, refer to the Maintenance and
Trouble Shooting sections of this manual. If you require any
further assistance please contact your local Macnaught distributor or Macnaught.
DESCRIPTION
KR PRESSURITE GUN FEATURES
Operation on the High Pressure Setting
1) The switch is pushed forward and lifts ball ‘A’ off its seat.
2) As the piston is pushed forward by the handle, the grease
in chamber 1 is pushed back past ball ‘A’ into the supply hose.
The KR PRESSURITE grease gun is a High Pressure / High
Volume grease gun. When set on the high pressure setting
you can reach greasing pressures up to 10,000psi (69 MPa).
The KR PRESSURITE gun is normally operated on the HIVOLUME switch position. Should high pressure be required
to clear a blocked or seized grease nipple, simply push the
switch on the gun to the HI-PRESSURE position.
3) The grease in chamber 2 (small volume) is pressurised up
to 69MPa (10,000 psi). This pressure seats ball B and lifts ball
C, then forces grease through to the equipment being
greased.
CHAMBER 1
ON HIGH PRESSURE
CHAMBER 2
Note: To select either high pressure or high volume, refer to
Fig 1.
HANDLE
PISTON
HIGH
PRESSURE
B
C
HIGH
VOLUME
A
CH
SW IT
Grease under pressure
Up to 1034kPa
(150 PSI) hose pressure
FOR HIGH
PRESSURE
Grease under pressure
Up to 69MPa
(10000 PSI) hose pressure
(Fig 1)
KR8 Issue 10 © 2013
Grease supplied from K4or K7
Pump via hose at a pressure of
1034kPa (150 PSI
1
Operation on the High Volume Setting
GENERAL MAINTENANCE
1) The switch is withdrawn allowing ball ‘A’ to seat.
When the KR gun has been serviced and the trouble is found
to have been caused by dirt in the valves, the pump unit
should also be cleaned out thoroughly to eliminate the dirt at
its source.
2) The piston is pushed foward by the handle. As ball ‘A’ is
seated, grease cannot return back into the hose. Therefore
both volumes of grease in chambers 1 and 2 are combined
(high volume) and pressurised for delivery to the equipment
requiring greasing.
3) During the operation balls ‘B’ and ‘C’ are forced off their
seats by both volumes of grease passing.
ON HIGH VOLUME
CHAMBER 1
CHAMBER 2
Dirt and foreign matter (lint, etc.) can seriously affect the
operation of this unit.
Dismantling and reassembly of this unit should only be attempted in clean conditions.
THE CORRECT METHOD FOR REMOVING THE KY
COUPLER FROM A GREASE NIPPLE
HANDLE
PISTON
B
C
A
CH
SW IT
Grease under pressure
Up to 1034kPa
(150 PSI) hose pressure
FOR HIGH
VOLUME
Grease under pressure
Up to 17MPa
(2500 PSI) hose pressure
Grease supplied from K4 or K7
Pump via hose at a pressure of
1034kPa (150 PSI
KR GUN PARTS DIAGRAM
KR8 Issue 10 © 2013
2
KR GUN PARTS LIST
Item
No. off
Order for replacem ent
New part/set
KIT. REF
KR-1K (Kit A)
KR-2K (Kit B)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
1
1
1
1
1
1
1
1
1
1
2
1
1
2
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
2
1
(A)
(B)
N/A - new gun required
A
A
A
A
A
A
A
KR12s
&B
&B
&B
&B
&B
&B
&B
A
A
A
A
A
A
A
A
A
A
A
A
KY
KH23s
N/A - new gun required
A&B
A&B
A
DESCRIPTION
OVERHAUL KIT
PISTON KIT
Gun Body
Piston spring
Valve Stem (Piston)
Spring, Piston Check
7/32" Ball. Piston
Glyde Ring
Glyd Ring O'ring (BS111)
Piston
Valve Seat
Operating Plunger Control
Cap Socket 1/2"X3/16" w hit
Spring, (inlet check)
5/16" Ball Inlet
O' ring, Seal Body (BS013)
O' ring. Plunger Control (BS008)
Control Body Assy
Washer, Hose Adaptor
O' ring, Hose Adaptor (BS113)
Ball End, Hose Adaptor
Ball. Socket Retainer
Keeper Screw (outlet)
Spring (Outlet)
1/4" Ball (outlet)
Outlet Body
Teflon Back Up Washer
O'ring. Piston (BS012)
Coupler
Extension Tube
Handle
Handle pin
Drive Screw
Retainer O'ring (BS017)
TROUBLE SHOOTING GUIDE
TROUBLE
CAUSE
REMEDY
A) Coupler Leaks
A) Dirt under the seat of the outlet
Ball (23) Note: There is nothing
wrong with the coupler itself.
A) Change to high volume and strike the handle sharply. If it still leaks, remove the
extension tube (28), spring keeper screw (21), spring (22) and ball (23).
Clean the seat and replace the ball, spring and spring keeper screw (part way). Prime
the pump, and screw in the spring keeper screw until the grease stops leaking. Then
screw in an extra 2 full turns. Reassemble extention tube (28)
Note: Too many turns makes the gun hard to operate, and too few turns allows the
gun to leak. If the coupler still leaks replace the complete outlet body assembly.
When refitting the outlet body (24) hold the handle (29) in the closed position. This
enables the back-up washers and o’ring seals to enter squarely onto the piston.
B) The valve stem (3) has worked
loose and is holding the outlet ball
(23) off its seat
B) Remove the handle pin (30), and handle (29). Remove piston (8), re-tighten valve
stem (3) or replace the complete piston assembly
B) Gun leaks at the Glyd ring worn
back end of the
piston.
Remove the handle pin (30) and handle (29). Remove the old piston and replace with
a new piston assembly.
C) Gun fails to A) Dirt under the delivery ball (5) or
deliver grease on damaged ball seat in the piston (8)
the high
B) Seals (25, 26) are worn
pressure setting
A) Change over to the high volume setting and strike the handle hard to shift dirt off
the seat. If there is no improvement, replace the piston assembly.
C) Valve stem (3) has become
Loose from the piston (8)
KR8 Issue 10 © 2013
B) Replace seals (25, 26) in the outlet body.
C) Replace piston assembly
3
TROUBLE SHOOTING GUIDE (CONTINUED)
TROUBLE
CAUSE
REMEDY
D) Gun fails to deliver grease on
the high
volume setting.
A) Dirt on the inlet valve seat (9)
Note: This fault will decrease volume.
A) Remove the control body (16), tap out the valve seat (9),
o’ring (14), ball (13) and spring (12). Clean parts and replace
in the correct order.
B) Operating plunger control (10) sticking
in body (16).
B) Replace the control body assembly.
O’ring (15) damaged or worn
Remove the control body and replace worn or damaged parts.
E) The control push rod in the control body leaks.
F) The gun leaks at the swivel joint. Worn seals (18,32).
G) The gun, when on the high volume setting is too slow or hard to
operate.
Replace worn or damaged swivel seals
A) Springs (2 or 4) may have collapsed and A) Fit KR-1K overhaul kit
is blocking the flow of grease.
B) Grade of grease is too heavy.
C) To much compression on
spring (22).
B) Change grease to NLGI No 2 grease or lighter.
the outlet C) Reset the spring keeper screw (Refer to A - a) of the trouble shooting guide) or replace the outlet body assembly.
TECHNICAL SPECIFICATIONS
The KR Grease gun is suitable for use with Macnaught
models K4 and K7 Lubrication systems.
The KR Grease Gun is recommended for use with
greases up to and including NLGI No 2 consistency.
The KR Grease Gun will deliver greasing
pressures up to 10,000 psi (69 MPa) on the high
pressure setting
For Warranty Terms and Conditions see macnaught.com.au
For a list of Australian Service Centres see macnaught.com.au
KR8 Issue 10 © 2013
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