Manitowoc Grove RT770E Service Maintenance Manual

2-83
GROVE
RT770E HYDRAULIC SYSTEM
2
Published 11/26/2014, Control # 447-05
1. Install the rod seal, wiper ring and O-ring in the inside of
the head.
2. Install the O-ring and backup ring on the outside of the
head.
3. Lubricate the rod with clean hydraulic oil.
4. Install the cylinder head on the rod.
5. Install the spacer on the rod.
6. Install the seal and wear ring on the outside of the piston,
and the O-ring on the inside of the piston.
7. Lubricate all parts freely with clean hydraulic oil.
8. Remove the cover from the barrel. Insert the rod and
attached parts into the barrel with a slight twisting
motion.
9. Clean all oil from the threads of the head. Coat the
threads with Loctite 271. Using a spanner wrench, screw
the head into place in the barrel.
10. Check the inside of the port block for any sharp edges or
burrs and remove as necessary with emery cloth.
11. Install new O-rings onto the holding valve.
12. Lubricate the holding valve and O-rings with clean
hydraulic oil.
NOTE: The holding valve should turn by hand until
compression of the O-rings begins.
13. Carefully install the holding valve into the port block until
fully seated.
14. Install the rod end lug on the cylinder rod and secure
with the bolts, washers, and nuts.
15. Pressurize and cycle the cylinder with hydraulic oil
pressure. Test the cylinder at 206.7 bar (3000 psi).
Check for proper operation and any leakage. Make
repairs as needed.
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 damage the O-rings during installation of the
holding valve. If the holding valve turns freely then gets
hard to turn, then easy to turn, remove the holding valve
and check the O-rings. They have probably been
damaged by a sharp edge of a port.
CAUTION
Do not use air pressure to cycle or pressurize the cylinder.
Damage to the seals may result.

Manitowoc Grove RT770E Specifications

General

Brand	Manitowoc
Model	Grove RT770E
Category	Construction Equipment
Language	English