HYDRAULIC SYSTEM RT880E SERVICE MANUAL
2-96 Published 11-10-2014, Control # 524-00
6. Thoroughly rinse parts, allow to drain, and wipe with a
lint-free rag. Inspect all parts for serviceability.
7. Flush the barrel and fluid tube. Drain and wipe dry with a
lint-free cloth. Compressed air may be used to blow out
barrel port.
8. Inspect the bore of barrel for nicks, gouges or scratches.
Replace barrel assembly if any of these conditions exist.
Assembly
NOTE: Lubricate seals and rings with clean hydraulic oil.
NOTE: Leave access to the setscrew hole on the piston by
only partially installing the bottom ring of the piston
seal into the groove leaving the gap in the ring at
the hole location.
9. Install the wear rings, rod seal and wiper ring in the
inside of the head and the O-ring and backup ring on the
outside of the head.
10. Install the O-ring and backup rings in the inside of the
piston and the seals on the outside of the piston.
11. Lubricate the ID of the head seals with clean light oil and
slide the head onto the rod. The head will need to be
tapped on with a rubber mallet to engage the seals.
Push the head about half way down the length of the
rod.
12. Install the spacer onto the rod with the ID lip at the piston
end.
13. Lubricate the ID piston seals with clean light oil and
thread the piston clockwise onto the rod assembly with
the spanner wrench until it bottoms out.
14. Install the setscrew with an allen wrench until hand tight.
Seat the piston seal bottom ring into the groove.
15. With the hoist, raise the rod assembly into a vertical
position taking care not to damage the OD seals on the
head and piston.
16. Lubricate the OD seals on the piston and head with
clean light oil and lower the assembly into the barrel.
Stop just before the head enters the barrel.
17. Place the spanner wrench on the head and turn counter-
clockwise while applying light downward force until
threads engage. Continue turning counterclockwise until
the thread clicks, then reverse direction to clockwise and
thread in until there is no gap between the head shoul-
der and the top of the barrel.
18. Instal the setscrew with an Allen wrench until hand tight.
19. Slowly lower the rod down to the fully retracted position.
NOTE: Oil or oil/air mixture may rapidly exit out of the ports
during extension. Shield the work area from the
exiting oil.
20. Pressurize and cycle the cylinder with hydraulic oil pres-
sure. Static pressure test the cylinder at 4500 psi
(31,026.4 kPa) in both directions. Check for proper oper-
ation 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.
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