Manitowoc Grove RT765E-2 Service And Maintenance Manual page 115

RT765E-2 SERVICE MANUAL
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.
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
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.
NOTE: Lubricate seals and rings with clean light hydraulic
oil.
1. Install the wear ring, buffer seal and wiper ring in the
inside of the head and the o-ring and backup ring on the
outside of the head.
2. Install the wear rings and lip seals on the outside of the
piston.
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.
GROVE
3. Clean all oil from the threads of the head. Coat the
threads with an anti-seize compound (ex: Never-Seez
paste lubricant or similar lubricant).
4. Slide the head onto the rod. The head will have to be
tapped on with a rubber mallet to engage the seals.
Push the head about half way down the length of the rod
assembly.
5. With the hoist, raise the rod assembly back into a
vertical position taking care not to damage the OD of the
seals on the head and piston.
6. Remove the cover from the barrel.
7. Lubricate the OD of the seals on the piston and head
with clean light hydraulic oil and lower the assembly into
the barrel. Stop just before the head enters the barrel.
8. Place the spanner wrench on the head and turn
counterclockwise until the thread clicks, then reverse
direction to clockwise and thread in until there is no gap
between the should of the head and the top of the barrel.
9. Install the retaining ring.
10. Make sure the setscrew hole is clean of all debris. Using
a screwdriver or 1/4 inch wrench, install the setscrew in
the head.
Do not use air pressure to cycle or pressurize the cylinder.
Damage to the seals may result.
11. Pressurize and cycle the cylinder with hydraulic oil
pressure.
(25,840 kPa). Check for proper operation and any
leakage. Make repairs as needed.
NOTE: After cycle test is complete, check that the
setscrews are properly torqued to prevent cylinder
leakage.
Published 9-04-2014, Control # 422-08
HYDRAULIC SYSTEM
CAUTION
Static test the cylinder
2
at 3750 psi
2-77