Repair
3A0020B
3
Repair
Required Tools
•
Vise with soft jaws
•
Set of adjustable wrenches
•
O-ring pick
•
3/16 in. hex key
•
Rubber mallet
•
3 1/4 in. socket
•
Torque wrench capable of 150 ft-lbs (203 N•m).
•
Anti-seize lubricant
•
Pipe sealant
Disassembly
1. Relieve pressure. See system manual for pressure
relief instructions.
2. Use two people to lift and clamp the cylinder (1) in a
vise.
3. Remove elbow fittings (4) from outside of seal hous
ings (2).
4. Use a 3 1/4 in. socket or wrench to remove one seal
housing (2). Place a waste container below the seal
housing and cylinder (1) to drain any residual
hydraulic oil.
5. Remove second seal housing (2).
6. Remove o-rings (2a) from seal housings (2).
NOTICE
Recommended Hydraulic Oil
Use Graco-approved Hydraulic Oil, Part No. 169236
(5 gal) or 207428 (1 gal)) or a premium, ISO grade
46 petroleum-based hydraulic oil containing rust and
oxidation inhibitors and anti-wear agents.
Before using any other type of oil in this motor, con
tact your Graco distributor. Unauthorized use of
lesser grade oil or substitutes may void the warranty.
Hydraulic Oil Working Temperature
The maximum hydraulic oil operating temperature is
160 °F (71 °C). The motor seals will wear faster and
leakage may occur if the pump is operated at higher
oil temperatures.
If the hydraulic oil temperature approaches 160 °F
(71 °C), check the hydraulic fluid supply cooling sys
tem, filters, etc. and clean or repair as needed.
Keep the hydraulic system clean
To reduce the risk of damaging the hydraulic driver,
verify that the hydraulic power supply fluid lines and
reservoir are clean and free from contaminants.
Carefully follow the manufacturer’s recommenda
tions on reservoir and filter cleaning, flushing, and
periodic changes of hydraulic fluid.
Always plug the hydraulic inlets, outlets and lines
when disconnecting them to avoid introducing dirt
and other contaminants into the system.
NOTICE
To prevent damage to sealing surfaces, do not
clamp any sealing surfaces in the vise.
NOTICE
To prevent damage to the driver, avoid getting dust
or dirt in the driver during service.
r_258640_3A0020A_2h
4
2a
2a
2
4
2
1
Summary of Contents for 258771
Page 7: ...Parts 3A0020B 7 ...
