Chapter 10 MAINTENANCE OF THE GENERATOR

Figure 9-3. Left side heat sink, removal and installation (Model MEP-026A).

TM-5-6115-271-14 Generator Set Gasoline Engine Driven Skid Mounted Tubular Frame. 3 Kw. Phase. AC. 120/208 and 120/240 Volts 28 VDC (Less Engine) Manual
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TM 5-6115-271-14

TO 35C2-3-386-1

TM-05926A-14

NAVFAC P-8-613-14

CHAPTER 10

MAINTENANCE OF THE GENERATOR

10-1. General

(e) Remove generator from generator set (A,

fig. 6-1), sheet 1 of 2, and remove the rotor assembly

Repair of the generator is limited to the inspection and

(B, fig. 6-l), sheet 2 of 2, from the stator assembly.

replacement of faulty parts. The generators on each

Remove diodes from the exciter rotor (17, fig. 10-4)

of the models covered by this manual are nearly iden-

and test with a multimeter. Replace any bad diodes.

tical in outward appearance. Test procedures are

If diodes are good, replace the rotor assembly.

similar except for the output as prescribed. Figures

(f) Reassemble generator set and repeat steps

10-1, 10-2 and 10-3 are included here as an aid to

(a) and (b).

maintenance personnel in troubleshooting and repair-

ing the generator sets.

(4) Installation.

10-2. Generator Maintenance

(a) Refer to figure 6-1 and install the

a. General. These maintenance instructions apply

generator.

to the generator after it has been removed from the

(b) Install the control box (fig. 6-3).

generator set. For correct procedures for removing

c. Models MEP-016A, MEP-016C and MEP-026A,

the generator from the generator set, refer to figure

MEP-026C

6-1.

(1) Removal.

b. Model MEP-021A, MEP-021C.

(a) Remove the control box (fig. 6-3).

(1) Removal.

(a) Remove the control box (fig. 6-3).

(b) Refer to figure 6-1 and remove the

generator.

(b) Refer to figure 6-1 and remove the

(2) Disassembly and reassembly. Refer to figure

generator.

10-5 to disassemble and reassemble the generator.

(2) Disassembly and reassembly. Refer to figure

10-4 to disassemble and reassemble the generator.

(3) Testing.

(a) Start generator set and allow it to warm up.

(3) Testing.

(b) Observe the voltmeter on the front of the

(a) Start generator set and allow it to warm up.

control box. If exciter, rotor, or stator is defective,

(b) Observe the voltmeter on the front of the

there will be no voltage reading on the set voltmeter.

control box. If exciter, rotor, or stator is defective,

(c) Manually flash the field windings as

there will be no voltage reading on the set voltmeter.

prescribed in paragraph 4-20e(2). If stator and rotor

(c) Manually flash the field windings as

are good, voltage will appear and hold on the set

prescribed in paragraph 4-20e(2). If stator and rotor

voltmeter.

are good, voltage will appear and hold on the set

(d) If voltage comes up, proceed with

voltmeter.

generator operation. If not, stop the engine and check

(d) If voltage comes up, proceed with

continuity of exciter stator by loosening terminal 20

generator operation. If not, stop the engine and check

or 21 on the voltage regulator terminal board and

continuity of exciter stator by loosening terminal 20

measure across the exciter stator leads with a

or 21 on the voltage regulator terminal board and

multimeter for an open or short circuit. If bad, then

measure across the exciter stator leads with a

replace the stator assembly.

multimeter, for an open or short circuit. If bad, then

(e) Remove generator from generator set

replace the stator assembly.

(A, fig. 6-1 sheet 1 of 2), and remove the rotor

assembly (B, fig. 6-1 sheet 2 of 2) from the stator

assembly. Remove diodes from the exciter rotor

(20, fig. 10-5) and test with a multimeter for

Change 9

10-1

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