New Leader L2020G4, General Manual

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P l e a s e G i v e P a r t N o . , D e s c r i p t i o n a n d U n i t S e r i a l N o .
HIGHWAY EQUIPMENT COMPANY
49
97373-A
Page Rev. A
TROUBLESHOOTING CONTINUED
Reason: Correction:
1. Hydraulic oil level low. Add hydraulic oil to reservoir up to “Full” mark.
2. Shut-Off valve on oil reservoir not open. Open valve fully by turning counter-clockwise until it stops.
3. Hydraulic Pump is not rotating.
1.
PTO is disengaged. Shift into engagement.
2.
Drive line has failed. Repair or replace.
3.
Key in pump shaft has failed. Replace key.
4.
U-joint pin or key has failed. Replace pin or key.
4. In-line relief valve set too low. In-line relief valve pressure should be 3100 PSI. Set spinner
control valve to “0”. Disconnect pressure line, coming from rear
port on spinner control valve, at control. Reconnect this line to
flow meter inlet port. Disconnect return line from control where
it joins the return tube running to the reservoir. Connect flow
meter load valve to return tube. Open load valve fully, run truck
engine at about 2750 RPM. Slowly close load valve until
pressure reaches 31000 PSI. If this pressure cannot be reached,
set up relief valve adjustment until gauge reads 3100 PSI.
CAUTION : Do not set pressure above 3100 PSI.
5. Worn pump. With flow meter arranged to check relief valve setting above,
open load valve fully. Read flow rate with truck engine running
at 2750 RPM. Close load valve until pressure reads 1000 PSI.
Flow rate should not decrease more than three (3) GPM. If
flow loss is greater, replace pump.
6. Mark Series relief valve open to return
line. Using relief valve testing adapter and flow meter, test valve for
opening pressure. If not 2000 PSI, replace relief valve.
7. Jammed or frozen spinner motors. Free up. If not possible, replace as required.
8. Jammed or frozen conveyor. Free up conveyor.
9. Jammed or frozen conveyor hydraulic
motor. Replace motor.
10. Conveyor hydraulic motor shaft key
sheared. Replace key.
11. Mark Series control gears stripped or
unpinned. Remove Mark series service hole cover. With hydraulics off,
when control is run in manual mode the idler arm should rotate
freely. If it doesn’t, examine for stripped gears or unpinned
gears. Replace as required. Check also for jammed valve spool.
If jammed, replace control unit.
12. Pump speed is not adequate to provide
sufficient flow to maintain spinner speed. Increase engine speed.
13. Insufficient hydraulic oil flow at normal
driving speeds. Check PTO-Pump matching. If insufficient flow results, install
higher percent PTO or use larger pump (Special).