Repair
3A6980A 15
Service Ram Pistons
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.
• Order Piston Repair Kit 24G853 for a stainless steel
ram. Kit parts are marked with a † in the illustrations
and parts list.
Disassemble the Piston and Seal
1. Follow the Pressure Relief Procedure, page 10.
2. Follow Disconnect the Diaphragm Pump, page
14, or Disconnect the Piston Pump, page 14.
3. Remove nuts (117) and lock washers (116) holding
the tie bar (114) to the piston rods (102). Also
remove nuts (4) and washers (3) holding the tie bar
to the tie rods (2).
4. Stainless Steel Rams: Remove the four screws
(124) and washers (123), then remove the piston
cap (120). Remove outer o-ring (121) and inner
o-ring (122) from piston cap.
5. Remove retaining ring (115).
6. Carefully pull the piston rod out of the top of the
cylinder.
7. Slide the piston seal housing (103) and spring (104)
up off of the piston rod (102). Remove outer o-ring
(105) and inner o-ring (106) from the piston seal
housing (103).
8. Remove the retaining ring (112) and bearing (111)
from the piston seal housing (103).
9. Carefully lay the piston (107) and rod (102) down so
the rod does not bend. Remove the nut (108),
washer (109), and piston (107). Remove the outer
o-ring (105) and inner o-ring (110).
10. Inspect parts for wear or damage. Replace as
necessary.
NOTICE
Do not tilt the piston rod when removing it from the
base or when installing it. Such movement can damage
the piston or the inside surface of the base cylinder.
FIG. 7: Piston Rod Seal
FIG. 8: Ram Piston.
124
123
120
121†
113
106*†
103
111*†
112*†
104*†
122†
115*†
105*†
TI16472a
102
107
108*†
109*†
110*†
105*†
TI10521a
102
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