Komatsu 930E-2, Shop Manual

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8. Position the control unit-face plate and attach the
regulator harness lead “4” to “E” terminal on the
face plate.
9. Attach the alternator phase lead to “R” terminal
(or phase terminals) on the face plate.
10. Use RTV #732 on the face of the housing. Use
Loctite in mounting screw holes for the face plate.
11. Install the face plate onto the housing while sliding
slot in the face plate onto grommet on regulator
harness. Attach the face plate to the housing with
4 screws.
12. Attach “B+” buss leads from rectifier to the back
of “B+” terminal.
13. Position “B+” buss leads from rectifier so that the
leads will not contact inside ends of “E” or “R”
terminals (or phase terminals).
14. Attach leads from the field coil to the terminal
block at “F” and “B+” positions.
15. Use RTV #732 to reseal the housing where the
field coil leads enter the housing.
16. Use RTV #3140 on inner ends of “R” (or phase
terminals) and “E” terminals, on the terminal
block, and all exposed wires on inner end of “B+”
stud to prevent corrosion.
17. Apply RTV #732 on the top of the housing.
18. Use five screws (coat with Loctite) to attach
control box cover to control box. Tighten screws
to 20 in. lbs. (2.2 Nm) torque.
REAR ROTOR ASSEMBLY
1. Place rotor assembly on shaft and core assembly
inside stator, field coil and shell assembly (Figure
13-32).
NOTE:Align stud or screw holes of core with scribe
marks on rotor, or center studs or screw holes of core
in the center of slots in rotor plate as shown in Figure
13-32.
2. Use six flanged locknuts or self tapping screws to
fasten rotor assembly to shaft and core assembly
(Apply loctite to studs before installing locknuts).
Torque flanged locknuts to 45 in. lbs. (5.0 Nm),
screws to 65 in. lbs. (7.3 Nm).
END HOUSING ASSEMBLY
1. Stand alternator on front end.Observe extra care
when installing housing if rotor shaft is equipped
with dust cap and ring seal carrier, as ring seal
must compress to enter into housing bore.
NOTE: If shaft has ring seal, rear housing must have
chamfer on bearing bore. Studs from stator, field coil
and shell assembly will come through holes in end
housing.
2. Ring Seal Conversion
The fan and shaft/core assemblies have been
modified to accommodate a new bearing ring seal
design (Figure 13-33). These changes affect al-
ternators manufactured after January 1996. The
changes affect the shaft and fan hub diameters
on full units and service parts. When new service
parts are used to repair units manufactured be-
fore January 1996, the ring seals and lip seals
must be removed.
FIGURE 13-32.
1. Studs or Screws
FIGURE 13-33.
1. Ring Seal Groove 5. Ring Seal
2. Ring Seal 6. Ring Seal Groove
3. Bearing 7. Fan Mounting Hardware
4. O-Ring 8. Fan Guard Screws
M13-22 Niehoff Alternator Overhaul Manual M13003 04/01