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Onan MDKBU Service Manual

Onan MDKBU
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7-10
REASSEMBLY
Reassembly is the reverse of disassembly. Note the
following when reassembling the generator:
1. Press a new exciter rotor or rotor shaft bearing
on up to its locating shoulder on the shaft. Do
not lubricate the shaft (Figure 7-1).
2. Torque the six or eight disc-to-hub bolts (Fig-
ure 7-1) to 5057 N-m (3742 lb-ft). Make sure
that:
A. The chamfered edge on the drive disc
perimeter faces out to make assembly with
the flywheel easier.
B. The rounded edges of the washers are on
the disc side.
3. Torque the six or eight disc-to-flywheel bolts
(Figure 7-1) to 2731 N-m (2023 lb-ft). Make
sure the rounded edges of the washers are on
the disc side.
4. On models with a generator-to-engine flange,
torque the flange bolts to 5060N-m (3745 lb-
ft) and the end bell flange bolts to 9 N-m (8 lb-ft)
5. On models with stator through bolts, use the
four throughbolts to help guide the stator on.
Thread the ends with less thread into the fly-
wheel housing and make sure the threads bot-
tom.
6. On models with stator through bolts, make sure
the scribed stator-flywheel index lines (Step 5,
Disassembly) register.
7. Torque the two exciter stator screws (Fig-
ure 7-1) to 11 N-m (8 lb-ft). The pole to which
the leads are tied must be up.
8. Wipe the bearing bore in the end bell lightly with
molybdenum disulfide grease and make sure
the rubber O-ring (Figure 7-1) is in place.
9. On models with stator through bolts, assemble
the end bell to the stator, making sure the
scribed index lines (Step 5, Disassembly) reg-
ister and the rotor bearing seats fully in the
bore. Pull the field leads out the same opening
as the stator leads. Torque the nuts on the gen-
erator throughbolts to 3843 N-m (2832 lb-ft).
10. Secure the end bell cover plate and torque the
four screws to 3.8 N-m (8 lb-in).
11. Reassemble all the remaining components.
Make sure to resecure the ring terminals of
grounding straps and leads with two star wash-
ers, one on each side, for good electrical conti-
nuity. Torque the vibration isolator through bolts
to 27-33 lb-ft (37-44.7 N-m).
RECONNECTING THE GENERATOR
Reconnect the generator properly for the applica-
tion. See Page A-2.
LINE CIRCUIT BREAKERS
WARNING
Accidental or remote starting can
cause severe personal injury or death. Before
removing a panel or access door, disconnect
the negative () cable at the battery to prevent
the engine from starting.
The line circuit breakers are mounted in the AC out-
put box. Disconnect all leads and check electrical
continuity across each pole. Replace a circuit
breaker if either pole does not reset or turn ON and
OFF. Reconnect the generator and load wires prop-
erly (Page A-2).
TO CHANGE FREQUENCY
See CHANGING FREQUENCY (Page 8-1).
TO ADJUST VOLTAGE
See ADJUSTING VOLTAGE (Page 8-2).
Redistribution or publication of this document,
by any means, is strictly prohibited.

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Onan MDKBU Specifications

General IconGeneral
BrandOnan
ModelMDKBU
CategoryPortable Generator
LanguageEnglish

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