Manitowoc Grove RT880E User Manual

HYDRAULIC SYSTEM RT880E SERVICE MANUAL
2-108 Published 11-10-2014, Control # 524-00
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. 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.
PARK BRAKE CYLINDER
Description
The park brake cylinder, mounted on the front axle, releases
and applies the park brake. The park brake cylinder consists
of a hydraulic cylinder and a lever. When the operator
positions the Park Brake Switch to ON, the park brake
solenoid valve de-energizes and closes the valve, removing
hydraulic force from the cylinder’s piston. This allows the
cylinder’s spring to extend, retracting the cylinder lever, and
applying the park brake to hold the crane in place. When the
operator positions the Park Brake Switch to OFF, the park
brake solenoid valve energizes and opens the valve to apply
hydraulic force to the cylinder’s piston. This allows the piston
to compress the spring, extend the cylinder lever, and
release the park brake.
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.

Manitowoc Grove RT880E Specifications

General

Brand	Manitowoc
Model	Grove RT880E
Category	Construction Equipment
Language	English