4-20. RADIATOR AND COOLING SYSTEM - Continued
4-20.2 Fan Assembly
This task covers
Tool Kit, General Mechanic, Automotive,
16, Appendix E Grease
1090-06060-02 Fan Clutch
1077-05827-02 Fan Hub
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 4-12)
Batteries Disconnected (see para. 4-24)
Engine Compartment Covers Removed (see para
Truck Wheels Blocked
All Air Tanks Drained
Disconnect air line from fan clutch piston.
Remove nut from end of fan clutch (1) and remove fan clutch piston.
Remove nuts (2) and lockwashers (3) retaining fan to fan hub. Fan clutch is locked on because no power
is on truck. However, fan will still slip so hold blades when loosening nuts.
Remove fan (4) and rest against radiator.
Remove fan clutch and pulley assembly as
detailed in b. following, steps 2 thru 6.
Remove fan through space between engine and
Place new fan against radiator, install through
space between engine and radiator shroud.
Install fan clutch and pulley assembly as detailed
in b following, steps 12 thru 17.
Place new fan over fan clutch and tighten nuts to
75 ft lb (100 Nm).
Install fan clutch piston and secure with nut.
Reconnect air line to clutch.
Rotate fan by hand to test clearance between fan and shroud. To disengage fan clutch, set fan switch to
AUTO. Fan clearance should be at least 1 in. (2.5 cm).