Graco 16P957 Supply Unit Repair, Ram Piston Rods, Repair Parts, 302b 302k 302m 302a 302c 302l

Repair

Supply Unit Repair

To reduce the risk of serious injury whenever you are instructed to relieve pressure always follow the Pressure Relief Procedure on page 10. Do not use pressurized air to remove the guide sleeve or the

NOTE: Do not reinstall end cap assembly if the ram pis- ton (302f) needs to be removed from the piston rod. See the next page for ram piston repair instructions.

303

302d

302e

piston.

Ram Piston Rods

Always service both cylinders at the same time. When you service the piston rod always install new o-rings in the piston rod seal and ram piston.

Repair Parts:

Piston Repair Kit 257622. See Ram Frame on page 26 for parts included in kit.

Disassemble Piston Rod Seal and Bearing

302b

302k

302m

302a

302c

302l

ti10520a

1.Relieve pressure.

2.Access piston rod seal and bearing.

a.Ensure ram is in lowest position.

b.Remove nuts (333) and lockwashers (332) from piston rods (302a).

c.Remove entire pump package, including the mounting plate (331) off of the piston

rods (302a). Use a fork-truck to lift the assembly from the mounting plate.

d.Secure pump package so pump and platen will not fall.

3.Remove retaining ring (303).

4.Remove piston rod seal and bearing. Slide end cap (302b), pin (302c), o-ring (302d), and spring (302m) up off of the piston rod (302a). Remove retaining ring (302l) and bearing (302k) from end cap (302b) and remove o-ring (302e).

5.Inspect parts for wear or damage. Replace as nec- essary.

FIG. 18: 3 in. Piston Rod Seal

20 3A2798D