Graco 309028ZAT, Instructions Manual

Page: 50 / 98

Ram Assembly Service
50 309028ZAT
Pump Removal
NOTE: See Parts on page 56.
1. Relieve the air pressure from the air motors and ram
assembly to be serviced. Follow the Fluid Pressure
Relief Procedure on page 34.
2. Disconnect electrical power from the system.
3. Move the RAM POSITION Switch (AG) to
HOLD/NEUTRAL.
4. Close the Pump outlet ball valves and relieve the
fluid pressure from the Pumps at the Pump bleed
valve on the ram assembly to be serviced.
5. Using an overhead lifting device, attach and secure
a chain capable of lifting the weight of the Pump
assembly to the eye at the top of the air motor.
NOTE: For effective Pump removal, the lifting point
must be directly above the Pump and capable of moving
sideways. The lifting action should be the “chain fall”
type that allows a slow upward and downward
movement.
NOTE: Check the Technical Specifications in the
separate Pump manual to find the weight of the Pump
being serviced. For example, Graco XL 10000™ 45:1
SST Pump (24Y208) weighs 236 lb (106 kg) per manual
308148.
6. Detach the air hose from the air motor.
7. Detach the fluid supply hose at the Pump outlet.
NOTE: When loosening the Pump and the air motor
fasteners in steps below, ensure the chain slack is taken
up to prevent the Pump assembly from falling.
8. On the Follower Plate adapter, loosen and rotate or
remove four lugs and hex bolts holding the flange of
the Pump lower.
9. On the underside of the air motor, remove the bolts
securing the air motor to the motor support
brackets. It may be necessary to move or remove
some brackets for effective Pump removal.
10. Detach any other connections to the Pump
assembly to ensure the Pump is free of attachments
before removal. Possible connections include:
• Air motor exhaust kit
• Pump proximity switch kit
• Pump grounding wire
NOTE: When lifting the Pump in steps below, ensure
the lifting chain does not damage the air controls
mounted at the top of the ram cross-members.
11. Using a “chain fall” style lifting device, slowly pull the
Pump upward a few inches until the base of the
Pump clears the Pump mounting adapter and the air
motor clears the support brackets.
12. Pull the Pump assembly out of the ram assembly
and guide the Pump assembly downward to the
floor, placing the base of the Pump on a wood
surface and taking care not to damage the seal area
of the Pump inlet housing.
13. Remove the gasket and o-ring (32, 33) from the
Pump adapter. They should be discarded and
replaced when the Pump is reinstalled.
14. Clean excess and hardened material from the Pump
adapter on the Follower Plate (D).
15. Ensure that material is not rising through the Pump
adapter in the Follower Plate (D). If material is
flowing upward, move the RAM POSITION Switch
(AG) to
RAISE until the flow stops, then move the
switch back to HOLD/NEUTRAL.
16. Move the Pump assembly to a suitable work area
and repair the Pump using the appropriate Graco
Instruction Manual.
Pump Installation
1. When the Pump is serviced and tested and ready to
be replaced in the Uni-Drum ram assembly, perform
the steps of the
Pump Removal procedure in
reverse order.
2. It is recommended that the Pump be tagged with the
type and date of repair and the name of the
technician who performed the repair.
3. Before returning the reassembled Pump to
production use, it must be primed with material and
air removed from the material. See the Starting and
Adjusting the Pump section in your appropriate
Pump Instruction manual shown in
Related
Manuals on page 3.