Advertisement
4-12 REAR SUSPENSION
PROBLEM
AIR PRESSURE IN
SYSTEM . COMPRES-
SOR OPERATES
ERRATICALLY-
TAKES TOO LONG TO
PRESSURIZE SYSTEM .
AIR LINES FROZEN
UP .
POSSIBLE CAUSE
5 .
6 .
Battery voltage too low
to operate motor.
Bearing failure which causes
unit to seize occasionally
and break loose "if galling
occurs.
1 . Water in tines .
CORRECTION
5 . Charge battery .
6 . Replace bearings or parts with
bearings.
1 . Drain wet tank.
ELECTRO-LEVEL CONTROLS TROUBLE DIAGNOSIS CHART
(Refer to Figure 6)
PROBLEM
COMPLETE OR
PARTIAL LOSS OF
AIR WITH TRAVEL
SWITCH IN "HOLD".
COMPLETE OR
GRADUAL LOSS OF
AIR OVERNIGHT AT
CAMPSIGHT WITH
IGNITION OFF .
COMPLETE OR
PARTIAL
LOSS
OF AIR
WITH TRAVEL SWITCH
IN "AUTO", IGNITION
ON . (COMPRESSOR
RUNS TOO FRE-
QUENTLY) .
TRAVEL SWITCH IN
"AUTO" . NOTHING
HAPPENS .
LEFT OR RIGHT
SWITCH IN "RAISE"
POSITION. VEHICLE
DOESN'T RAISE .
COMPRESSOR RUNS .
POSSIBLE CAUSE
1 . Leak in air bellows.
2 . Leak at air lines between
bellows and solenoid.
3 . Leak in. 2-way solenoid .
1 .
2 .
3 .
4 .
Leak at air bellows.
Leak in air line between
solenoid and bellows .
Leak at fitting between
solenoid and air line or
bellows and air line .
Defective 2-way solenoid
valve .
1 . Air leak in system .
2 . Defective height control
valve.
1 . Compressor not operating .
2 . Defective control switch .
3 . Defective pressure switch .
4 . Defective diode.
5 . Defective wiring.
6 . Check relay .
7 . Defective solenoid valves.
8 . Leak at air bellows .
9 . Leak in air lines .
1 .
2 .
3 .
4 .
Leak in air lines .
Solenoid valves plumbed
incorrectly. (RAISE sole-
noids .)
Faulty HOLD solenoid valves
Faulty RAISE solenoid.
CORRECTION
1 . Eliminate air leak.
2 . Eliminate air leak .
3 . Service or replace solenoid.
1 . Eliminate air leak.
2 . Eliminate air leak .
3 . Eliminate air leak .
4 . Service or replace solenoid.
2 .
Eliminate air leak. Note: Vehicle
should be operated with travel
switch in "HOLD" position . Do
not operate vehicle with travel
switch in "AUTO".
Service or replace valve.
1 .
2.
3 .
4.
5 .
6.
7.
8 .
9 .
Check feed at ground wire.
Replace switch .
Replace switch .
Check diode . Replace as required .
Check wiring and electrical con-
nections.
Replace relay.
Service or replace solenoid valves .
Eliminate air leak.
Eliminate leak .
1 . Eliminate air leak.
2 . Properly install solenoid valve.
3 . Service or replace valves.
4 . Follow bench check of solenoid .
Service or replace as necessary .
Advertisement
