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TM 5-4210-220-34
2-13.
FIRE PUMP - Continued
2-13.8
Fiber Driving Wheel.
This task covers
Repair
TOOLS
MATERIALS/PARTS
Shop Equipment, Automotive
WRP 7938 Tab Washer
Maintenance and Repair,
UMP 7915 Fiber Wheel
NSN 4910-00-754-0705
EQUIPMENT CONDITION
Main Engine Shutdown
(see TM 5-4210-220-12)
APU Shutdown
(see TM 5-4210-220-12)
Batteries Disconnected
(see TM 5-4210-220-12)
Pump Access Panels Removed
REPAIR
(1)
Using a block of wood, wedge it between water ring primer and bearing housing to disengage fiber wheel from
drive pulley.
(2)
Straighten the tab washer (2) and remove
nut (1).
(3)
Pull center piece (3) from primer shaft (6).
(4)
Remove woodruff key (5) from primer shaft
(6).
(5)
Remove the fiber driving wheel (4) from the
center piece (3) by removing nuts (9),
lockwashers (8) and capscrews (7).
(6)
Inspect center piece (3) for cracks, warped
flanges, or oblong shaft hole. Replace as
necessary.
(7)
Attach the fiber driving wheel (4) to the
center piece (3) using
capscrews
(7)
lockwashers (8) and nuts (9) Torque nuts
evenly to 12 ft lb (16 Nm).
(8)
Install woodruff key (5) into primer shaft (6).
(9) Aline center piece (3) key slot with woodruff
key (5), then slide onto the primer shaft (6).
(10) Install new tab washer (2) and nut (1) onto primer shaft (6). Tighten nut to 44 ft lb (60 Nm).
(11) Bend tab washer (2) onto one nut flat.
(12)Adjust water ring primer to drive pulley as detailed in step 39 and 40 in para. 2-13.7. If adjustment is
necessary loosen locknuts and setscrews on fulcrum prior to adjusting. (13) Check disengaging unit to primer
adjusting screw clearance as detailed in step 28 of para. 2-13.11.
2-110
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