OWNER’S MANUAL 8/31/21 Page 16 of 18
STK TROUBLE SHOOTING GUIDE
DANGER: Before doing any trouble shooting that exposes a moving part or requires
someone to be near the boom or track system, engine start-up must be prevented. See the
MAINTENANCE PREPARATION section page 6.
Drawings referred to in this section can be found in your assembly exploded views manual.
A. Entire hydraulic system does not operate, and the engine is not under load.
1. Low hydraulic fluid in tank.
Add hydraulic fluid until it shows in sight gauge.
2. Hydraulic pump-to-engine coupler has slipped.
Check couplers and rubber spider, replace as needed. See drawing 00572, 00572-H13
NOTICE: Engine – pump couplers must have a 1/8” gap.
3. Main pump suction leaking air into pump intake.
Check main suction hoses and fittings for leaks and tighten fitting nuts.
B. Engine lugs down or dies, tracks and chain do not turn.
1. Rocks or other obstructions stopping chain.
Reverse chain momentarily to free it from obstruction. Remove obstruction 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 allow oil alert to reset. Check oil
level, fill as needed.
5. Engine losing power due to wear.
See engine manual, repair or replace as needed.
C. Chain fails to rotate, but track drive works.
1. Chain Control Relief Valve out of adjustment.
Adjust Relief Valve to 2800 PSI (E13STKH) / 3300PSI (16STKB), replace relief spring
if needed. See drawing 00322-STK, contact tech support.
2. Chain motor worn.
Rebuild or replace motor.
3. Chain drive pump worn.
Replace pump. New hydraulic motors and pumps are available from Barreto
Manufacturing.
4. Spindle splines stripped out.
See drawing 00574
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