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4-20 REAR SUSPENSION
FRONT
24 3/8"
FRAME
GROUND LEVEL
FRONT RIDE HEIGHT 131/8" ± 1/4"
23' MODEL
40 3/8"
26' MODEL
56 3/8"
REAR RIDE HEIGHT 11 11/16" ±
1/4"
A-3985
3. Place straight edge across face of wheels
as shown in figure 21 .
4 . Measure distance from straight edge to
frame at front tire and rear tire as shown.
Toe should be A = B plus or minus .0625" .
5. Add toe shims as required . One toe shim
changes A = B by .125".
REAR WHEEL CAMBER
The
rear
wheels are set with positive
camber.
Positive camber is outward inclina-
tion of wheels at top.
To check camber, use an accurate gauge .
The camber should be set at 00 to +1/2 0. (See
figure 19 .)
Excessive positive camber results in ir-
regular wear of
tires at
outer shoulder.
Negative or reverse camber causes wear at
inner shoulders .
Camber is adjusted by shimming as shown in
figure 20.
Follow the same shimming pro-
cedure used to set toe-in.
AIR COMPRESSOR PRESSURE
SWITCH ADJUSTMENT
The switch is designed to maintain air
pressure in the air reservoir between 100 and
120 psi. If the pressure in the reservoir drops
to 100 psi the contact points will close and this
will complete the circuit, supplying electricity
to the compressor.
If the pressure raises
above 120 psi the contact points will open the
circuit to the compressor . This setting may be
adjusted at the nut which is located on the end
of the spring inside the cover . (Refer to figure
22 .)
The pressure will rise by tightening the
spring .
Both the cut-in pressure and the cut-
out pressure will be affected by this adjust-
ment .
The pressure can be measured at the
Schrader valve on the wet tank .
Figure 23-Checking Vehicle Ride Height
RIDE HEIGHT ADJUSTMENT
Measure the rear suspension ride height at
the elongated slot on the frame rail. Refer to
figure 23 .
To adjust ride height loosen adjustment nut
on height control valve (See figure 24 .) The
valve arm has an elongated hole at the
adjustment nut. This allows the valve arm to
move in relation to the valve itself, and thus
allows the ride height to change .
Intake and
exhaust valves of height control valve can then
be operated independently of linkage .
When
proper ride height is reached tighten nut to 70-
80 in . lbs.
Height control valve lever will move 1/4
inch up or down from neutral position (free
travel) without causing any valve action .
If
amount of adjustment required falls within
these limits, adjust lever the required amount.
Figure 24-Location for Rear Ride Height Adjustment
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