Manitowoc Grove RT880E - Page 125

Grove Published 11-10-2014, Control # 524-00 2-87
RT880E SERVICE MANUAL HYDRAULIC SYSTEM
2
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 wiper ring, lip seal, buffer seal
and wear ring in the inside of the head.
2. Install the replacement O-rings and backup ring on the
outside of the head.
3. Install the lip seals and wear rings onto the outside of the
piston.
4. Lubricate the rod with clean hydraulic oil.
5. Slide the head, onto the rod. Tap the head with a rubber
mallet to engage the seals. Push the head about half
way down the length of the rod assembly.
6. Remove the cover from the barrel.
7. With a hoist, raise the rod assembly back into a vertical
position taking care not to damage the OD seals on the
head and piston.
8. 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.
9. Place a spanner wrench on the head and turn counter-
clockwise until the thread clicks, then reverse direction
to clockwise and thread in until there is no gap between
the head shoulder and top of barrel.
10. Install the retaining ring onto the rod.
11. Install the setscrew into the head.
12. Pressurize and cycle the cylinder with hydraulic oil pres-
sure. Test the cylinder at 3750 psi (25,856 kPa). Check
for proper operation and any leakage. Make repairs as
needed.
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.