Page 47
Troubleshooting Diagnosis Chart
FUNCTION SYMPTOM POSSIBLE CAUSE REMEDY
9.00
PLATFORM
FOLD
(In)
8.00
PLATFORM
UP
9.10
No
Operation
9.30
Faulty or
Sluggish
Operation
8.60
Front and Rear
Parallel Arms
Not “In-Time”
(out-of-sync)
8.41 Backup pump release valve
contamination
8.42 See 8.11 and 8.20
8.51 See 8.13
8.61 See 2.22, 2.23, 2.24, 2.26, 2.27 and
2.29
8.62 Air in hydraulic lines
9.11 Platform not fully raised
9.12 See 1.00 and 8.25
9.13 Up/Fold Microswitch defective or out
of adjustment
9.14 Platform Hydraulic Pressure Sensor
Switch out of adjustment or
defective
9.15 Microswitch or hydraulic pressure
switch harness(s) disconnected,
damaged or otherwise defective
9.21 See 8.20
9.31 See 2.21, 2.22, 2.23, 2.24, 2.26,
2.27, 2.28, 2.29, 9.13 and 9.14
9.41 See 8.40
10.11 See 8.11, 8.22, 8.24 and 8.41
10.12 Lost prime
10.13 Air leak at backup pump to pump
interface (O-rings)
10.21 See 3.20
10.22 Lift platform has drifted against
Lift-Tite™ latches
Flush clean or replace.
See Systems
Descriptions for Priming and Flushing
procedure
Check hydraulic fluid level and add
Dextron III transmission fluid if required.
Cycle lift 10 times pausing a few
moments between cycles to allow air to
move out of lines. Note: Check oil level
with platform fully lowered and roll stop
fully unfolded.
See Systems Descrip-
tions for details.
Raise platform
Adjust or replace.
See Microswitches in
Systems Descriptions for details (pages
36-39)
Adjust or replace.
See Platform Hydraulic
Pressure Sensor Switch in Systems
Descriptions for details (page 41)
Connect, repair or replace
Prime.
See Systems Descriptions for
Priming and Flushing procedure
Check tightness or leaks
Pump lift platform fully up then release
8.40
Platform
Drifts
Down
8.50
Faulty Floor
Level Switching
9.20
Motor Runs
But
Doesn’t Fold
9.40
Platform
Drifts
Down (Out)
10.10
Up
(Faulty Operation)
10.20
Down
(Faulty Operation)
10.00
MANUAL
BACK-UP
PUMP
continued
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