SECTION 5 300HH, 375, 375H, 375HH, 425 AND 425H USER MANUAL R00
63
d. Remove any dirt from the fluid filter cap
before filling the sump.
e. Fill the receiver tank with fluid in accordance
with the specifications in Section 3.
6. Clean or replace the return line strainer.
7. Change the air filter primary elements.
8. Change the compressor fluid filter.
9. Clean the return line orifice.
10. Change the fuel filter. (If the filter tends to
clog more often than what is expected,
change the filter more frequently.)
11. Change the engine fuel/water separator.
12. Check the engine rpm idle speed. The idle
speed should be at the specified minimum
idle speed listed in Section 3.
5.7 MAINTENANCE EVERY 1500
HOURS
1. If the compressor fluid is Sullair AWF,
change the fluid and replace the fluid filter
element. (See Compressor Fluid Filter Ele-
ment Replacement on page 63.)
2. Service the engine cooling system.
3. Lubricate axle bearings on wheel-mounted
units.
5.8 PART REPLACEMENT AND
ADJUSTMENT
PROCEDURES
COMPRESSOR FLUID CHANGE PROCEDURE
1. Run the compressor five to ten minutes to
warm the fluid.
2. Shut the compressor down and relieve all
internal pressure.
3. Drain the fluid sump by removing the plug, or
opening the valve at the bottom of the sump
tank.
4. Change the compressor fluid and replace the
fluid filter element (For element replacement
see the filter servicing procedure in this Sec-
tion.)
5. Fill the sump with fluid in accordance with
the specifications in Section 3.
COMPRESSOR FLUID FILTER ELEMENT
REPLACEMENT
Refer to Figure 5-1.
1. Remove the old element with a strap
wrench.
2. Clean the gasket seating surface.
3. Apply a light coating of fluid to the new gas-
ket.
4. Hand tighten the new element (P/N 250025-
525) until the new gasket is seated.
5. Continue tightening the element by hand an
additional 1⁄2 to 3⁄4 turn.
6. Restart the compressor and check for leaks.
WARNING
Operating the compressor at below its mini-
mum specified idle speed will damage the
compressor. Operating the compressor in
this condition will cause coupling and/or
compressor failure.
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