i n s t r u c t i o n s to maintain a safe level beyond the
50 HOUR MAINTENANCE OPERATIONS
freezing point.
ENGINE MAINTENANCE
Tighten Air Cleaner Connections: Tighten all
CHECK COOLING SYSTEM FOR LEAKS
hose clamps and air cleaner mounting bracket
bolts. Check all hoses and pipes between air cleaner
DRAIN FUEL TANK SEDIMENT
and engine for cracks or leaks, which will permit
CHECK ANTI-FREEZE PROTECTION
dust laden air to by-pass air cleaner entering di-
rectly into engine. Serious and costly damage to
TIGHTEN AIR CLEANER CONNECTIONS
the engine will result. See "500 Hour Maintenance
Operations" for servicing air cleaner filter element.
CHECK AND ADJUST BELT TENSION
Check and Adjust Belt Tension: Each 50 op-
CHECK HYDRAULIC SYSTEMS FOR LEAKS
erating hours inspect all drive belts for serviceable
CLEAN TORQUE CONVERTER AND
c o n d i t i o n and proper tension. Neglect and im-
TRANSMISSION BREATHER
proper tension often leads to inadequate cooling,
bearing failure of the driven part and short belt
CHECK LIGHTS AND FUSES
life. Belts should be just tight enough to drive the
SERVICE BATTERIES
moving parts without slipping.
TIGHTEN WHEEL NUTS AND INSPECT RIMS
Note: Due to older belts having been stretched,
CHECK AIR CHAMBERS AND LINES FOR LEAKS
through use, beyond their original length and pre-
v e n t i n g newer belts from carrying most of the
CLEAN CYLINDER RODS
load, it will be necessary to replace all belts as a
matched set when one or two belts in the set are
Engine Maintenance: Refer to Operation and
worn or damaged beyond serviceable condition.
Maintenance Manual of engine manufacturer for
maintenance instructions of engine and accessor-
All new belts will loosen after operating for a
ies.
day or two and must be rechecked and retensioned
Check Cooling System for Leaks: Check radia-
if necessary. At specified intervals check and re-
tor, hoses, oil cooler, water pump and drain cocks
tension fan belts as follows :
f o r leaks and correct where necessary. Loss of
coolant due to ruptured hoses, loose clamps, leak-
G.M. ADJUSTMENT
ing pump or drain cocks can and will result in ex-
1. Loosen the four mounting bolts securing the
p e n s i v e repairs or replacement of engine compo-
fan drive pulley bracket as shown in Figure 12.
nents.
Drain Fuel Tank Sediment: Every 50 operat-
2 . Turn fan bracket adjusting bolt clockwise to
ing hours loosen drain plug in hand hole cover on
raise fan drive pulley (increasing belt tension)
bottom of fuel tank and drain off any accumulated
or counterclockwise to lower fan drive pulley
(decreasing belt tension) depending on the ex-
water.
isting condition.
Check all fuel lines, fuel pump, filters, and shut-
off cocks for leaks and correct where necessary.
3. Turn the adjusting bolt so that 3/4 inch maxi-
Open drain cock at bottom of filters, when pro-
mum deflection is obtained on the belts midway
vided, and drain off accumulated water and sedi-
between the pulleys as shown, in Figure 12.
ment.
4 . When belts are properly adjusted, retighten
Check Anti-Freeze Protection: At specified in-
the four mounting bolts securing the fan drive
tervals, or whenever anticipating extremely cold
pulley.
weather, use a hydrometer to check freezing point
of solution (permanent type anti-freeze) when it
CUMMINS ADJUSTMENT
is at operating temperature. If necessary add ad-
1. Loosen locknut securing fan drive pulley to
d i t i o n a l anti-freeze according to manufacturer's
[45-02-1]
