Zoomlion RT60 Maintenance And Service Manual

Edition 2 Chapter 2 Page 2-4
Feb/2013 Troubleshooting
2.3 EXTEND / RETRACT SYSTEM
Table 2-3
Part Problem Cause Remedy
Electrical System
Boom cannot retract
a) Balance valve defective
b) Electrical system defective
c) Main valve leaks internally
d) Pilot control valve defective
e) Retraction rope and fittings
defective
Repair
Repair
Repair
Repair solenoid coil
Examine
Boom cannot extend
a) Relief valve pressure is set
too low
b) Main boom length detector
is not adjusted correctly
c) Electrical system defective
d) Foot valve defective
e) Pilot control valve defective
f) Extension rope and fittings
defective
Adjust or replace
Adjust or repair
Repair
Repair
Repair solenoid coil
Examine
Boom retracts
automatically during
operation (will not hold its
position)
a) Cylinder internally leaks
b) Balance valve defective
c) O-ring for the balance
valve worn
d) Oil cylinder, valves or
fittings leak
Repair the seal ring
Repair
Replace the O-ring
Repair

Zoomlion RT60 Specifications

General

Brand	Zoomlion
Model	RT60
Category	Construction Equipment
Language	English