Heavy-Duty Service Schedule for VHD-Series 91
51 Check rear suspension torque rods,
hangers and brackets for looseness or
cracks. Check springs for broken
leaves or wear and cracks on air
springs.
52 Inspect rear shock absorbers for leaks.
53 Check rear tandem axle components as
the front tandem axle. Check interaxle
driveshaft.
54 Check fifth wheel for loose bolts.
Check lock mechanism wear with a
gauge. Check slide mechanism for
function and wear (if equipped).
Fuel System
55 Check fuel tank(s) for rotation, leaks
and damage. Check J-brackets.
56 Check fuel lines for routing, wear and
leaks.
Wheels and Hubs
57 Check wheel rims for signs of cracks.
Check tighten wheel nuts. (See page
152.)
58 Check tire pressure. Check tire tread
for unusual wear pattern. Measure
tread depth. (See page 153.)
59 Check wheel hubs for leaks and
proper oil level. (See page 154.)
60 Check wheel bearing clearance.
Brakes
61 Drain air tanks. If a lot of condensate
is drained, check air dryer. (See page
145.)
62 Measure thickness of brake linings.
(See page 146.)
63 Check slack adjuster throw and opera-
tion. (See page 146.)
64 Check dual brake system operation
(tank check valves). (See page 147.)
65 Inspect air tubing for routing and
wear. (See page 148.)
Steering and Suspension
66 Check steering wheel play. (See page
143.)
67 Check front springs and fasteners.
Check tighten the spring U-bolt nuts.
(See page 155.)
68 Check front shock absorbers for leaks.
69 Check steering gear for leaks.
70 Check pitman arm for signs of loose-
ness in fasteners.
71 Check steering shaft, drag link and tie-
rod for damage and wear.
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