912 Owner’s Manual
8/31/21
Page
14
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16
912 TRENCHER TROUBLE SHOOTING GUIDE
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.
A. Entire hydraulic system does not operate and the engine is not under load.
1. Broken or improperly adjusted clutch
(actuator) cable
See clutch cable and actuator arm adjustment. Adjust
or replace cable.
2. Low hydraulic oil in tank
Add oil until it shows in sight gauge.
3. Hydraulic pump-to-engine coupler has
slipped.
Check for wear and replace both coupler halves and
rubber spider, as needed.
B. Engine lugs down or dies and wheels and chain do not turn.
1. Rocks or other obstructions stopping
chain.
Reverse chain momentarily to free it from obstruction.
Raise boom and stop chain. See if obstruction can be
removed from trench.
2. Trenching depth or speed too great for
soil conditions.
Decrease ground speed or trenching depth.
3. Engine improperly tuned or maintained.
See engine manual and correct as needed.
4. Low oil alert causes engine to shut
down.
This may occur when trenching on hills. Level
trencher, check oil and allow oil alert to reset.
5. Engine losing power due to wear.
See engine manual.
C. Chain fails to rotate, but wheel drive works.
1. Chain motor worn.
Rebuild motor or replace. New motors are available
from Barreto Manufacturing.
2. Chain Control Relief Valve
malfunctioning.
Adjust Relief Valve to 2200 psi or replace relief spring
if needed.
3. Sprocket spindle spline teeth worn or
broken.
Replace spindle.
