Bulletin: MHPOMI1304
OPERATION AND MAINTENANCE MANUAL FOR
MANUAL HAND PUMP- ALL MORIN ACTUATORS
Description:
The optional hydraulic manual hand pump (MHP) option provides an emergency override capability for an actuated valve. The MHP unit consists of a hydraulic cylinder and a handpump connected by a selfcontained hydraulic system. Standard features include speed control valves, removable 24-inch handle, and internal pressure relief valve.
Specifications:
Reservoir volume:
Stroke Displacement:
Hydraulic Fluid:
75 cu.in.
0.60 cu.in./stroke.
ISO-22 (Chevron hydraulic oil AW or Equal petroleum base only.)
Maintenance Requirements:
No routine maintenance is required except to maintain fluid in reservoir. Do not exceed the maximum fluid level. Seal repair kit is available if servicing is required. The hydraulic cylinder seal kit is included with the standard repair kit for the entire actuator. A pump repair kit is available separately.
Figure 1 Hydraulic Schematic
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Bulletin: MHPOMI1304
OPERATION AND MAINTENANCE MANUAL FOR MANUAL HAND PUMP
Operation Instructions:
A. Remote Operation
When the actuator is operated by air, the selector valve must be in the remote (center) position. (Figure 1)
B. Local Operation
1. Release the air supply to the actuator.
2. Shift the selector valve to the desired open or close position (figure 1).
3. Install the pump lever and operate the pump until the actuator position indicator reaches the desired position. The actuator is hydraulically locked in this position until the selector valve is moved.
4. Return the pump handle to the storage holder and lock in place with the pump plunger down (figure 2).
5. To return the actuator to remote control, restore the air supply and return the selector valve to the remote (center) position. Caution: a spring return actuator will shuttle to its fail position when the selector is moved.
Important:
1. For safety reasons, never operate the selector valve unless the pump handle has been removed and placed in its is in its storage holder.
2. Spring return actuators will not require pumping in the failure mode direction.
Hydraulic fluid level:
The fluid level in the handpump reservoir changes when the actuator is operated. The fluid level is higher when the hydraulic cylinder piston rod is retracted into the hydraulic cylinder. The fluid level is lower when the hydraulic cylinder piston rod is extended out of the hydraulic cylinder. Measure the fluid level in the lower position, using a dip stick, and maintain this fill level as shown on the sticker (1 inch above the pump base). Operate the actuator open and closed with its fill plug securely in place and view the fluid level to verify where the low position is. Be sure to tighten the fill port plug securely to avoid hydraulic fluid overflow. Caution: Do not exceed this fluid level or fluid may squirt out of the relief valve.
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Figure 2
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REPAIR
KIT
Bulletin: MHPOMI1304
OPERATION AND MAINTENANCE MANUAL FOR MANUAL HAND PUMP
Replacement Parts – Hand pump only
Repair parts for hand pumps are limited to the
Following components. Items 1, 2 and 3 are
Available only as a kit. Item 4 is available seperately.
ITEM
1*
2*
3
4
DESCRIPTION
RELIEF VALVE
FILL PLUG* & O-RING
SELECTOR VALVE & O-RINGS
HANDLE
Locate the pump part number stamped on the pump as shown in Figure 1 and order the corresponding repair kit or handle.
PUMP
MODEL
NO.
REPAIR KIT HANDLE
100619
B-RKMHP1
100719
100816
100879* 15-1399
100915*
B-RKMHP2
100925*
100950*
B-RKMHP3
200879*
200915*
B-RKMHP4
* Relief valve and fill plug is only furnished for these pump models.
Figure 3
Repair / seal kits for the hydraulic cylinder portion of the MHP are available as part of the complete actuator seal repair kit. Contact the factory for the part number for the actuator kit.
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Bulletin: MHPOMI1304
Disassembly Procedure:
The manual hydraulic override is composed of parts from the Morin standard hydraulic actuator and standard pneumatic actuator. Please refer to the maintenance manuals for those products for diagrams and parts lists and fastener torque specifications. Read the Morin standard hydraulic actuator and standard pneumatic actuator manuals and follow all the safety warnings. Disengage the power supply and remove the actuator from the valve before proceeding with actuator disassembly. Caution: Be aware that spring return actuators must be disassembled per the actuator maintenance instructions because of the danger of stored spring energy.
For the Manual Hydraulic Override assembly:
1. Remove the manual hand pump assembly by loosening the tubing connectors at the hydraulic cylinder and unbolting the hand pump mounting bracket. Plug the ends of the tubing to retain the hydraulic oil and keep dirt out of the hydraulic system.
2. Remove hydraulic cylinder endcap; tie rods and cylinder piston bolt and piston.
For a single cylinder actuator:
3. Remove the remaining hydraulic endcap by withdrawing the four mounting bolts from inside the actuator housing.
4. Remove the piston rod seal and bushing.
For a two cylinder actuator:
5. Remove the pneumatic tie rods and slide the endcap back with the piston rod assembly to gain access to the inside.
6. Remove the four bolts and seal washers from inside the pneumatic endcap to release the remaining hydraulic cylinder endcap. Then slide the seals, bushing, and endcaps off the piston rod.
7. Remove the hydraulic cylinder piston rod from the pneumatic piston.
Assembly Procedure:
Assembly is in reverse order of the disassembly procedure. Lube all seals with Dow Corning 55 seal lube.
Use loctite 262 on the piston rod stud. Fill the hydraulic cylinder with hydraulic oil prior to installing the handpump tubing to minimize air in the hydraulic system. Operate the actuator pneumatically several times to bleed any trapped air. Add oil to the handpump reservoir up to the fill level line. This level will vary as the actuator strokes. Check to be sure that the oil level never exceeds the maximum fill line in both open and closed positions. (Approximately 1 inch from the base of the reservoir).
Pneumatic Actuators - Installing a Manual Hand Pump Supplied As a Kit:
Normally for a single cylinder double acting or spring return actuator, the manual hand pump kit is installed in place of the rod cover assembly. However, installing the manual hand pump in place of the rod cover is not possible in the field without replacing the actuator housing. Therefore all manual hand pump kits supplied for field installation must be installed on the endcap of the actuator.
If the actuator is a two-cylinder spring return actuator, install the kit on the shorter cylinder end. For two cylinder double acting actuators, the kit can be installed on either endcap but the left endcap is preferred.
(When facing the Morin nameplate).
Installation Procedure:
Replace the existing pneumatic endcap with the one included assembled with the kit. Remove and discard the piston bolt but retain the lock washer. Screw the piston rod of the hydraulic cylinder in place of the
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Bulletin: MHPOMI1304 piston bolt using the piston bolt lock washer. Bolt the hydraulic cylinder and pneumatic endcap assembly on to the pneumatic actuator. Install the handpump and bleed per instructions above.
Assembly view showing hydraulic cylinder, hand pump, and pneumatic cylinder (Figure 1)
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Bill of Material for Manual Handpump Components
Bulletin: MHPOMI1304
Hydraulic Actuators - Installing a Manual Hand Pump Supplied As a Kit:
Single cylinder hydraulic double acting actuators:
Field mounted kits are not offered because the main powerhead housing would need to be disassembled and machined to accept the handpump cylinder assembly.
Two-cylinder hydraulic double acting actuators:
1. Install the handpump bracket on one of two cylinders (see figure 1).
2. Install the handpump with the reservoir fill port up.
3. Locate and remove steel vent plug fittings on the two inboard endcaps. Fill the two ports as full as possible with Chevron type AW hydraulic oil (or equal mineral oil based oil).
4. Install stainless steel hydraulic tubing and tube fittings (3000 psi minimum rating) between the port on each inboard endcap and the hydraulic control valves on the pump.
5. Fill the pump to the fluid level noted on the pump. Cycle the actuator using remote power several times to work the air out of the handpump and refill as required to the max fill line.
Spring return hydraulic actuators:
The manual handpump hydraulic cylinder must be installed on the spring cylinder. See instructions above for installing a manual handpump on a pneumatic actuator.
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