Thomas ProTough 300 Screener, Owner'S/Operator'S Manual

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47
4.4 150 HOUR SERVICE
4.4E Engine Cooling System
Check the coolant level daily. Add only
50 / 50 mixture ethylene glycol. Do not use
or mix in other types of coolant. Add
coolant to the overflow reservoir (S0069a)
as required to be above the minimum cold
level.
Correct coolant mixture must measure
- 32ºF (-32ºC) using an accurate measuring
device.
The engine coolant needs to be flushed
and changed every year or after 900 hours
of operation, which ever comes first
(S0069b, S0042). See section 4.7 for 900
hour service information.
Check the radiator fins for obstruction
of damage. Clean the radiator using com-
pressed air and or flush with water.
Straighten bent fins carefully.
Do not exceed 40 psi (276 kPa) when
servicing the radiator. Wear safety
glasses when using compressed air.
Wear rubber gloves when working
with coolant.
WARNING
S0069a
S0069b
S0042
Coolant level
Engine block coolant drain
Radiator coolant drain
Wear rubber gloves and use eye protec-
tion when handling coolant.
IMPORTANT
46
4.4 150 HOUR SERVICE
4.4D Engine Fan Belt
Check the fan belt condition (S0042).
Replace if cracked or chipped. Replace
every 2 years or at 600 hours, whichever
comes first.
Check belt tension half way between the
crankshaft and alternator pulley (S0020).
Correct tension is 10 ~ 12mm deflection @
98 newtons force. (3/8 ~ 1/2 in. @ 22 lbs.).
To adjust the fan belt:
1. Loosen the bolts retaining the alternator
to the engine (S0069).
2. Use a pry bar to tension the fan belt and
tighten the top alternator bolt.
3. Check the tension. Repeat steps 1 ~ 2 if
necessary.
4. Tighten bottom alternator bolt.
To replace the fan belt:
1. Loosen the alternator bolts.
2. Remove the fan guard.
3. Replace the fan belt, set tension as out-
lined above.
4. Replace the fan guard.
S0020
S0069
S0042
Alternator pulley
Crankshaft pulley
Measure
deflection
Alternator / fan drive belt
Alternator / belt adjustment bolts
4. MAINTENANCE 4. MAINTENANCE