912 Owner’s Manual
8/31/21
Page
15
of
16
912 TRENCHER TROUBLE SHOOTING GUIDE (Continued)
CAUTION!! Always use extreme care when trouble shooting or making adjustments on the trencher.
Stay clear of the chain and auger when the engine is running. Stop the engine before disassembling any
component.
D. Wheels fail to turn, but chain rotates.
1. Hubs unlocked.
Lock the hubs.
2. Wheel axle key sheared.
Replace key and other parts as needed.
3. Wheel Drive Valve not fully activated.
Adjust valve cable as shown on page 8.
4. Speed Cable broken or disconnected.
Replace or re-connect cable.
5. Pump Cable Lever loose on shaft.
Tighten setscrew on Pump Lever.
E. Oil leaks in hydraulic system.
1. Fittings are loose.
Tighten fittings on hoses and adapters.
2. Worn or broken hoses.
Replace damaged hoses.
3. Oil around chain motor or shaft.
Inspect motor for leaking shaft seal. Rebuild or replace
motor. New motors are available from Barreto
Manufacturing.
F. Foaming hydraulic oil coming from breather hose.
1. Improper oil used.
Verify that hydraulic fluid used had antifoaming
additives. Tractor transmission / hydraulic fluid ISO 68
is recommended for use in temperatures above +32°F.
2. Air leaking into oil.
Inspect and tighten fittings and clamps on pump and
hoses.
G. Boom does not lift, or does not lower into ground.
1. Boom lift relief valve
malfunctioning
Adjust relief to 500 psi. This may require a
replacement spring in valve.
