Copyright 12/14 72 S/N XXXX WO#XXXXXX
Smoracy, LLC
MODEL 3680 TROUBLE SHOOTING
TROUBLE SHOOTING GUIDE
PROBLEM - FEEDWHEEL YOKE WILL NOT RAISE USING THE MANUAL CONTROLS: (cont.)
(All other hydraulic systems are working)
Possible Cause Possible Solutions
Low hydraulic system pressure. A quick check of the hydraulic pressure can be done
by placing the pressure gauge into the diagnostic port
provided on the control valve. Pull the Feedwheel Yoke
manual control handle towards you to check the
working hydraulic pressure. A 2050 PSI (141 bar)
reading would indicate that the Feedwheel Yoke is
mechanically stalled by some obstructing material. A
very low pressure reading would indicate a hydraulic
problem with the pressure relief valve or the hydraulic
pump. See “Procedure for checking hydraulic pump
and relief valve setting” in the Hydraulic Section.
No hydraulic system pressure. Trace the pressure line from the valve bank back to
the manifold used for the Hydraulic Shut Down
system. Identify the electric solenoid for this circuit
and verify that you have a 24 volt reading (12 volt on
some models) with the ignition switch on. These
solenoid valves need to be energized or the oil is
pumped back to tank. If you have the proper voltage,
try swapping this solenoid with another to determine if
it is bad. If the problem moves to the circuit you
swapped with then the solenoid is at fault. If the
problem stays with the circuit you are working on then
the pump is your problem.
Broken piston or bad seals in lift cylinders. Oil coming out of the vent plug at the top of the
cylinder would indicate a problem. Repair or
replace cylinder.
PROBLEM - FEEDWHEEL YOKE WILL NOT LOWER USING THE MANUAL CONTROLS:
(All other hydraulic systems are working)
Possible Cause Possible Solutions
Yoke Lock Bars engaged Raise Feedwheel and release Safety Chain and
or Safety Chain attached. disengage Yoke Lock Bars.
Material wedged or bound up Do not attempt any type of maintenance without first
around Feedwheel Yoke. disengaging clutch, turning off engine, waiting for the
Cutterhead to come to a complete stop, turning
Battery Disconnect Switch off, and you must have the
ignition key in YOUR possession. Raise Feedwheel
Yoke and install all safety devices, then check around
Feedwheel Yoke to determine what might be
restricting it from coming down.
Bent lift cylinder rod. Repair or replace lift cylinder.
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