POWER TRAIN GRT880 SERVICE MANUAL
7-12
Published 10/19/2017, Control # 618-00
Check the condition of the valve and lips frequently and keep
them clean. The valve lips should be open only when the
engine is shut down, or running at low idle speed. If the valve
is turned outside in, check for a clogged air cleaner inlet.
Malfunction of this valve does not reduce the air cleaner
effectiveness, but does allow the element to get dirty faster
and reduces serviceable life. If a valve is lost or damaged,
replace it with a new valve of the same part number.
Duct Work
1. Check the intake pipe cap and screen for accumulation
of leaves, trash, and other debris that could restrict air
flow. Repair the screen or replace the cap if any large
holes are found in the screen.
2. Check all mounting hardware for security to eliminate
possible vibration of intake piping. Such vibration leads
to early failure of hoses, clamps, and mounting parts,
and can cause hoses to slip off the connecting pipes,
allowing un-filtered air into the engine air intake.
3. Check hoses for cracks, chafing, or deterioration, and
replace at the first sign of probable failure.
Charge-Air Cooler System
The charge-air cooler (CAC) (Figure 7-12) is used to cool
engine air after it has passed through a turbocharger, but
before it enters the engine. The charge-air cooler provides
better horsepower, increased fuel efficiency, and reduces
engine emissions.
The CAC system consists of the ducting to and from the
charge-air cooler and a engine-driven fan. The charge-air
cooler system must be air-tight in order to work efficiently.
The ducting consists of metal tubing, hose clamps and
bellows. The recommended installation torque for the large
constant tension clamps is 10.2 to 11.3 Nm (90 to 100 lb-in)
and the small constant tension clamps is 5.7 Nm (50 in-lb).
Do not compress the spring completely, the bellows and/or
clamp may be damaged from thermal expansion of the CAC
tube.
Maintenance
1. Check hose clamps for proper torque.
2. Inspect bellows for cracks or holes.
3. Clean charge-air cooler. Remove any dirt or debris.
FIGURE 7-12
1
2
8804-110
1 Engine Coolant Radiator
2 CAC Assembly
Reference Only
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