78 Severe Service Schedule for VHD-Series
Maintenance Categories
Category a:
Every 250 Hours or 1 1/2 Months
(Whichever comes first)
1 Perform the daily checks as described
in the beginning of the vehicle Opera-
tor’s Manual.
2 Change engine oil. (See page 116.)
3 Change oil filters, both full-flow and
bypass. (See page 117.)
4 Lubricate the chassis according to the
lubrication chart on page 163.
CAUTION
If the vehicle is driven in extremely
severe road or off-road conditions
in salt, snow, deep water and/or
mud, adjust the lubrication schedule
to as often as once per day. See the
lubrication chart notes for more in-
formation.
5 Inspect all steps and grabhandles.
Make sure they are properly fastened
and that there are no signs of breakage.
Category A:
Every 500 Hours or 3 Months
(Whichever comes first)
1 Clean engine and chassis before in-
spection.
2 Do the maintenance points as de-
scribed under Category a.
3 Change primary (see page 129) and
secondary (see page 131) fuel filters.
4 Visually inspect the component and all
fluid pipes, hoses, seals, gaskets and
connection points on engine, transmis-
sion and rear axle(s) for exterior signs
of leakage.
5 If using standard antifreeze in the en-
gine cooling system, check the SCA
level of the coolant. (See page 45.)
6 Check the amount of fluid in the air
tanks. (See page 145.)
7 Check all instrument telltales for func-
tion. (See the Operator’s Manual for
function description.)
8 Start the engine and check the starter
motor function and that the engine
starts normally.
9 Check operation of all interior lights.
10 Test the function of the horn(s).
11 Check the function of the low pressure
warning switches in the air system.
(See page 148.)
12 Test air compressor cut-in and cut-out
pressure. (See the Operator’s Manual.)
13 Check the parking brake function.
Check clutch operation and pedal free
play. Adjust if necessary.
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