Repair
36
3A5379B
Supply Unit Repair
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 the ram piston.
Disassemble Piston Rod Seal and Bearing
1. Perform the
Pressure Relief Procedure
on page
14.
2. Disconnect power.
3. Remove the pump package. See
Remove Driver
on page 35.
4. Access the piston rod seal and bearing.
a. Ensure the ram is in the lowest position.
Remove nuts (383) and lockwashers (382) from
the piston rods (302n). Remove the entire pump
package, including the mounting plate (381) off
of the piston rods (302n). Secure the pump
package so the pump and platen will not fall.
See pages 40 and 42.
5. Remove the retaining ring (203, 803).
6. Remove the piston rod seal and bearing.
a. Slide the end cap (202a), pin (202b), o-ring
(202c), and spring (202m) up and off of the pis
-
ton rod (202n). Remove the retaining ring
(202k) and bearing (202j) from the end cap
(202a) and remove the o-ring (202d).
7. Inspect all parts for wear or damage. Replace as
necessary.
NOTE:
Do not reinstall the end cap assembly if the ram
piston (202e, 802e) needs to be removed from the pis
-
ton rod. See the next page for ram piston repair instruc
-
tions.
To reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 14. Do not
use pressurized air to remove the guide sleeve or
the piston.
F
IG
. 48: 3 in. Piston Rod Seal
WLD
202n
202m
202k
202j
202a
202c
203
202b
202d
