Stellar Industries 28000 - Manual (Page 53)

49 Troubleshooting 49
Vibrations and jerking in hydraulic cylin-
der during the first maneuvers. The temperature of the hydraulic oil is
too low.
lack of oil in reservoir.
Perform maneuvers without loads for
several minutes to warm up the oil.
Add hydraulic oil.
Vibrations with every function when oil
is hot. Lack of oil in reservoir.
air in hydraulic system.
Add hydraulic oil to the tank.
Operate the control carrying the cylin-
ders to stroke end several times in both
directions.
All crane movements are slow, loaded
and unloaded. Suction hose from oil tank crushed or
obstructed.
Dump valve malfunctioning.
The pump is drawing in air.
Replace or clean the suction hose.
Manually override system to detect
Tighten suction hose connections.
The hydraulic extension is not extend-
ing. Bad lubrication.
Wear pads are worn.
Sequence valve on extension cylinder
has to be adjusted.
Lubricate the wear pads
Replace wear pads.
Check to see if there is 12V power
going to the extension function.
Crane rotation not regular Inadequate grease.
The truck is not level.
Worn rotation motor.
Gear bearings worn.
Grease gear bearing.
Level the truck.
Replace rotation motor.
Replace gear.
The crane does not lift the loads on the
load chart. Defective hydraulic pump.
Incorrect settings of the valves.
Hydraulic cylinder seals are worn.
Replace the pump.
Adjust valve settings.
Replace worn seals.
The crane lifts the load, but cannot hold
it. Incorrect relief setting.
Faulty holding valve.
Incorrect settings of the valves.
Hydraulic cylinder seals are worn.
Contact Stellar customer service for
proper setting.
Replace holding valve.
Adjust valve settings.
Replace worn seals.
Noise coming from Articulation points. Lack of lubrication.
Worn pin.
Worn bushing.
Grease articulation points.
Replace pin.
Replace bushing.
Troubleshooting continued...
Problem Possible Cause Possible Solution