HYDRAULIC SYSTEM RT880E SERVICE MANUAL
2-102 Published 11-10-2014, Control # 524-00
7. Stone out minor blemishes and polish with a fine crocus
cloth.
8. Clean with solvent and dry with compressed air any
parts that have been stoned and polished.
Assembly
NOTE: Lubricate seals and rings with clean hydraulic oil.
1. Install the replacement O-ring, wiper, and rod seal in the
inside of the head.
2. Install the replacement O-ring and backup ring on the
outside of the head.
3. Install one replacement wear ring on the outside of the
piston. Leave the other wear ring off for now so there is
still access to the piston’s setscrew hole.
4. Lubricate the rod with clean hydraulic oil.
5. Slide the head, larger outside diameter end first, onto
the rod.
6. Slide the spacer onto the rod.
7. Screw the piston onto the rod until it can go no further.
Hold the piston in place with the setscrew.
8. Install the other replacement wear ring on the outside of
the piston over the setscrew.
9. Lubricate all parts freely with clean hydraulic oil.
10. Remove the cover from the barrel. Insert the rod and
attached parts into the barrel with a slight twisting
motion.
11. Clean all oil from the threads of the head. Coat the
threads with an anti-seize compound (Never-Seez paste
lubricant or similar). Using a chain wrench, screw the
head into place on the barrel so its larger outside diame-
ter end is flush with the end of the barrel.
12. Check the inside of the port block for any sharp edges or
burrs and remove as necessary with emery cloth.
13. Lubricate the counterbalance valves with clean hydrau-
lic oil.
14. Carefully install the counterbalance valves into the cylin-
der port block until fully seated.
15. Pressurize and cycle the cylinder with hydraulic oil pres-
sure. Static test the cylinder at 3,000 psi (20,684 kPa).
Check for proper operation and any leakage. Make
repairs as needed.
CAUTION
Before installing new seals and rings, clean all surfaces
and carefully remove burrs and nicks. Parts displaying
excessive wear or damage should be replaced.
CAUTION
When installing new seals and rings, avoid stretching
seals or scratching the grooved or gland surfaces. Make
sure parts are clean before and during assembly. Make
sure seals and rings are installed in the proper order.
CAUTION
Exercise extreme care when handling the rod. Damage to
the rod surface may cause unnecessary maintenance
and expense. Also, take care to avoid damaging grooved
or gland surfaces or rings or seals during rod insertion.
CAUTION
Do not use air pressure to cycle or pressurize the cylinder.
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