Graco 235345, Instructions-Parts List Manual

Page: 8 / 30

Service
8 307158ZAP
Service
Pressure Relief Procedure
1. Lock the gun trigger safety.
2. Shut off the hydraulic power supply.
3. Close the supply line shutoff valve, and then the
return line shutoff valve.
4. Unlock the gun trigger safety.
5. Hold a metal part of the gun firmly to the side of a
grounded metal pail, and trigger the gun to relieve
pressure.
6. Lock the gun trigger safety.
7. Open the drain valve (required in your system),
having a container ready to catch the drainage.
8. Leave the drain valve open until you are ready to
spray again.
If you suspect that the spray tip or hose is completely
clogged, or that pressure has not been fully relieved
after following the steps above, very slowly loosen the
tip guard retaining nut or hose end coupling and relieve
pressure gradually, then loosen completely. Now clear
the obstruction.
Before you start:
Be sure you have all necessary parts on hand.
1.
Repair Kit 220457 is available for Models 217338.
Repair Kit 223654 is available for Models 235345,
262818, and 24W139.
Repair Kit 18B078 is available for Model 217022.
2. The repair kits must be purchased separately. An
asterisk behind a reference number in the parts list,
for example (25*), indicates that the part is included
in the repair kit.
3. Clean all parts as you disassemble them and
inspect them for wear or damage. Replace parts as
necessary.
Disassembly (Refer to Fig. 3)
NOTE : Use all the replacement parts that are in the
repair kit.
1. Flush the displacement pump if possible.
2. Relieve the pressure.
3. Stop the pump at the bottom of its stroke.
4. Disconnect the displacement pump hoses.
Disconnect the hydraulic hoses and plug all
hydraulic connections and lines to prevent
contamination.
5. Disconnect the displacement pump from the motor,
as explained in your separate pump manual.
6. Place the hydraulic motor in a bench vise.
7. Push or lightly tap the piston (49a) up as far as
possible.
NOTE : The tie rod nuts (3), socket screws (8), cap
screws (24), and retainer (49b) are fastened with
Loctite® TL--242. Heat may be used sparingly to soften
adhesive sealant during disassembly.
The system pressure must be manually relieved to
prevent the system from starting or spraying
accidentally. Fluid under high pressure can be
injected through the skin and cause serious injury. To
reduce the risk of an injury from injection, splashing
fluid, or moving parts, follow the Pressure Relief
Procedure whenever you:
• are instructed to relieve the pressure,
• stop spraying,
• check or service any of the system equipment,
• or install or clean the spray tip.
To reduce the risk of serious injury whenever you are
instructed to relieve pressure, always follow the
Pressure Relief Procedure on page 8.
NOTICE
Avoid getting dust or dirt in the motor during service.
Cleanliness is essential when repairing a hydraulic
motor. Foreign particles like dust or dirt in the
hydraulic fluid can increase friction between moving
parts and increase component wear.
NOTICE
When removing the displacement pump, hold it
securely. The pump is heavy and could fall off the
motor if not held securely, causing damage to the
outside of the pump.