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HIGHWAY EQUIPMENT COMPANY
50
97373-A
Page Rev. A
TROUBLESHOOTING CONTINUED
Reason: Correction:
14. Defective spinner control valve. Replace valve metering spool spring. If no improvement, replace
spinner control valve.
15. Cab control is for conveyor only—
spinners run anytime vehicle engine is
running, PTO is engaged and spinner
control valve is in a running position.
None required. This is a normal condition. To stop spinners, set
spinner control valve at “O” position, disconnect PTO, or shut off
vehicle engine.
16. Excessive oil is being pumped.
1. PTO percentage too high. Change PTO to smaller
percentage or use smaller pump.
2. Pump is too large. Do not exceed 30 GPM pumping rate.
Change to smaller pump or use smaller percentage PTO.
3. Pressure drop in control valve is sufficient to run lightly
loaded conveyor motor. Shut off pump drive by disengaging
PTO shaft.
17. Worn motor (spinner or conveyor). Motor heats up at an excessive rate (check for this heating when
system is cold). Replace motor.
18. Improper or deteriorated hydraulic oil. Replace hydraulic oil with proper specification oil and replace
filter.
19. Pinched or obstructed hose, hydraulic
line or fitting.
Clear obstruction or replace part. Straighten kinked hoses.
20. Driving too fast for application rate. Shift truck transmission to a lower gear. Will not normally occur
if within maximum application rates.
21. Synco-Matic Mark series cog-belt
drive has failed.
Cog-belt is broken or disengaged. Reset or replace. Cog drive
pulleys may be unpinned—re-pin to shaft.
22. Synco-Matic Mark series control
gear has failed.
Examine gears for stripping or being disconnected. Replace.
23. Defective radar. Check speed on console. Repair or replace radar as required.
24. Defective gear train in Mark series
valve.
Remove cover from Mark series control valve. Idler arm should
rotate around connection gear. If not, replace gear train.
25. Locked spool in Mark series valve. Check as for defective gear train above. If arm does not rotate,
check for stripped gears in gear train. Replace gears if stripped.
With new gears, the idler gears will not turn with hand pressure,
check for locked valve spool. Replace Mark series valve if spool
is jammed.
26. Control processor’s power is in “Off”
position.
Turn on control processor.
27. Involves the controller. Refer to control manual.