Heavy-Duty Service Schedule for VHD-Series 93
Category B: Annually
1 Check headlight aim and adjust if nec-
essary.
2 Remove wheels and brake drums on
all wheels. Inspect all wheel brake
components and parts for signs of
wear, warping and cracks.
3 Check function of tractor protection
valve.
4 Check for spring pin wear. (See page
156.)
5 Measure wear in steering knuckles.
6 Measure wear in steering linkage.
7 Check wheel toe-in.
8 Check tandem axle alignment.
9 Pressure test cooling system and check
for leaks and proper relief valve pres-
sure.
10 Remove fan belts and check all hubs
and pulleys for signs of wear and
cracks. Inspect fan for cracks and
damage. Inspect water pump for wear
and leaks.
11 Change power steering filter. (See
page 143.)
12 Remove the cab fresh air filter after
60,000 miles (96,000 km) or at least
once per year and clean in a soap so-
lution. Dry and reinstall. Change filter
after third use or maximum 240,000
miles (385,000 km).
13 Remove inlet air hose to the turbo.
Check turbo shaft for wear. Check
hose and inside turbo for signs of oil
leakage past the shaft seals.
14 Check starter motor current draw. In-
spect mounting for looseness and
cracks. Check wires for wear and fray-
ing and terminal tightness.
15 Test alternator voltage and ampere
output. Check mounts for secureness
and cracks.
16 Check battery hold-downs for proper
placement and tightness. Check all
wire terminal condition and tightness.
Clean all terminals and apply corro-
sion preventive.
17 Check power and ground studs from
batteries and also in engine compart-
ment.
18 If equipped with a Volvo engine,
check function of engine preheater.
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