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Lubrication & Maintenance/500 Hour/12 Month
RG,RG34710,5575 –19–27JUL06–1/1
Checking Air Intake System
RG4689 –UN–20DEC88
Check Clamps
RG7332B –UN–22JAN99
Underloader Valve and Air Restriction Indicator
A—Clamps
B—Dust Unloader Valve
C—Air Restriction Indicator
IMPORTANT: The air intake system must not leak.
Any leak, no matter how small, may
result in internal engine damage due to
abrasive dirt and dust entering the
intake system.
1. Inspect all intake hoses (piping) for cracks. Replace as
necessary.
2. Check clamps (A) on piping which connect the air
cleaner, engine and, if present, turbocharger. Tighten
clamps as necessary. This will help prevent dirt from
entering the air intake system through loose
connections causing internal engine damage.
3. If engine has a rubber dust unloader valve (B), inspect
the valve on bottom of air cleaner for cracks or
plugging. Replace as necessary.
IMPORTANT: ALWAYS REPLACE primary air cleaner
element when air restriction indicator
shows a vacuum of 625 mm (25 in.)
H
2
O, is torn, or visibly dirty.
4. Test air restriction indicator (C) for proper operation.
Replace indicator as necessary.
IMPORTANT: If not equipped with air restriction
indicator, replace air cleaner elements
at 500 Hours or 12 Months, whichever
occurs first.
30-11
080706
PN=148