Terex RT500-1 User Manual

Winch Circuit
CONDITION CAUSE REMEDY
WINCH WILL NOT DEVELOP
MAXIMUM LINE PULL
Main relief valve is set too low Readjust the main relief
Main relief valve is sticking See section on “Relief Valves”
Winch motor worn
excessively or damaged
See section on “Fluid Motor”
Tandem pump worn
excessively or damaged
See section on “Pumps”
Rotary manifold leaking
internally
Reseal rotary manifold
Low oil level Add oil as required
WINCH WILL LOWER BUT
WILL NOT RAISE
The sprag clutch is
assembled backwards
Be certain that the winch is
assembled properly
Insufficient parts of line for
the load being lifted
See the reeving diagram on
the capacity chart
WINCH WILL RAISE BUT
WILL NOT LOWER
The winch hold valve is
mounted on the winch motor
incorrectly
Be certain that the winch is
assembled properly
The winch hold valve spool is
sticking
Repair or replace
The winch brake is not
releasing
Be certain that the brake
release line is open. If
necessary, disassemble and
inspect the brake
components.
Winch brake piston “O” ring
damaged
Replace “O” ring
WINCH WILL NOT HOLD
LOAD (LOAD DRIFTS DOWN)
System back pressure too
high
Warm oil: check for
restriction in down stream
flow
The over-running sprag on
the brake is broken
Inspect and replace, if
necessary
The automatic brake is not
applying
Be certain that the winch
brake release line is not
plugged and no foreign
objects are in the brake
assembly.
The winch brake friction
plates are worn
Replace friction plates
219REVISED:

Terex RT500-1 Specifications

General

Brand	Terex
Model	RT500-1
Category	Construction Equipment
Language	English