red roo HT912, Operation, Safety & Maintenance Instructions, Page: 12 / 32

1.
2
3.
.
D. Wheel fails to turn, but chain rotates.
Hub unlocked
Wheel Drive Valve not fully activated
Wheel axle key sheared
Lock the hubs.
Replace key and other parts as needed
Adjust valve cable
4.
5.
Pump Cable Lever loose on shaft
Speed cable broken or disconnected Replace or re-connect cable
Tighten setscrew on Pump Lever
1.
2.
E. Oil leaks in hydraulic system.
Fittings are loose
Worn or broken hoses
Tighten fittings on hoses and adapters
Replace damaged hoses
3. Oil around chain motor or shaft Inspect motor for leaking shaft seal.
Rebuild motor or replace with exchange motor.
1.
G. Boom does not lift, or does not lower into ground.
Boom lift relief valve malfunctioning Adjust relief to 500 psi. This may require a
replacement spring in valve
1.
F. Foaming hydraulic oil coming from breather hose.
Improper oil used. Verify that hydraulic oil used had antifoaming
additives. Recommended oil is tractor hydraulic.
(Shell Donax TD or comparable)
RH912 TRENCHER TROUBLE SHOOTING GUIDE (CONT.)
12
1.
2
3.
.
D. Wheel fails to turn, but chain rotates.
Hub unlocked
Wheel Drive Valve not fully activated
Wheel axle key sheared
Lock the hubs.
Replace key and other parts as needed
Adjust valve cable
4.
5.
Pump Cable Lever loose on shaft
Speed cable broken or disconnected Replace or re-connect cable
Tighten setscrew on Pump Lever
1.
2.
E. Oil leaks in hydraulic system.
Fittings are loose
Worn or broken hoses
Tighten fittings on hoses and adapters
Replace damaged hoses
3. Oil around chain motor or shaft Inspect motor for leaking shaft seal.
Rebuild motor or replace with exchange motor.
1.
G. Boom does not lift, or does not lower into ground.
Boom lift relief valve malfunctioning Adjust relief to 500 psi. This may require a
replacement spring in valve
1.
F. Foaming hydraulic oil coming from breather hose.
Improper oil used. Verify that hydraulic oil used had antifoaming
additives. Recommended oil is tractor hydraulic.
(Shell Donax TD or comparable)
RH912 TRENCHER TROUBLE SHOOTING GUIDE (CONT.)
12
HT912 TRENCHER TROUBLE SHOOTING GUIDE (CONT.)