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TM 10-4320-342-24
3-20. PUMP AND CLUTCH (200 GPM FUEL PUMP) REPAIR - continued
Refer to Figure 3-24.
(7)
Use formula G - H - D + I - J - K - L = M to determine thickness of shim stack number two (1).
(a)
Measure clutch rotor set (2) to determine dimension G.
(b)
Subtract dimension H from dimension G. Dimension H is same as dimension F from shim stack number
one.
(c)
Subtract dimension D as recorded earlier in para 3c(d).
(d)
Measure clutch housing (3) to determine dimension I. Add dimension I.
(e)
Install clutch rotor set (2) in field clutch (4). Measure from surface of clutch rotor set (2) to edge of field
clutch (4) to determine dimension J. Subtract dimension J.
(f)
Measure field clutch (4) to determine dimension K Subtract dimension K.
(g)
Subtract dimension L. Dimension L is constant. L = 0.050.
(h)
Dimension M is the required thickness of shim stack number two (1) based on the above.
Example of formula: 1.300 - 0.090 - .162 + 0.655 - 0.188 - 1.475 - 0.050 = .040
(8)
Select shim stack number two (1).
NOTE
Three or more shims may be used to obtain dimension M above. Shims are made
up of laminated layers and thickness of each layer is 0.002.
(a)
Select appropriate number of shims (1) to obtain dimension M above.
(b)
If necessary, peel appropriate number of laminated layers (5) from shim to achieve dimension M above.
NOTE
Insure electrical connections on field clutch are aligned with slots on clutch housing.
(9)
Install required shim stack number two (1), field clutch (4) in clutch housing (3) and secure with screws (6) and flat
washers (7).
(10)
Press clutch rotor set (2) through bearings in clutch housing (3) and install nut (8).
3-58
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