CHAPTER 6 GENERAL MAINTENANCE INSTRUCTIONS

TM 5-6115-423-15

CHAPTER 6

GENERAL MAINTENANCE INSTRUCTIONS

Section 1. SPECIAL TOOLS AND EQUIPMENT

63. Special Tools and Equipment

64. Specially Designed Tools and Equipment

No specially designed equipment or tools

No special equipment or tools are required

are required by direct and general and depot

by direct and general support and depot main-

maintenance personnel for performing mainte-

tenance personnel for performing maintenance

nance on the load bank.

on the load bank.

Section Il. TROUBLESHOOTING

67. Power Absorber Overheats

65. General

Possible remedy

Probable cause

This section provides information useful in

Fan inoperative ____________ Repair or replace fan

diagnosing and correcting unsatisfactory oper-

motor if faulty. Tighten

ation or failure of the load bank or any of its

fan blade if loose. Check

components. Each trouble symptom stated is

and retighten connec-

tions to fan motor

followed by a list of probable causes of

(para 36 and 90).

trouble. The possible remedy recommended is

described opposite the probable cause.

68. Relay Does Not Operate

Possible remedy

Probable cause

66. Fixed Load Switches are on but no

Relay is defective_________Test and replace relay if

defective (para 75)

Load is Applied

Possible remedy

Probable cause

69. Variable Load Switches Does Not

Defective contactor K-1 .-Replace or repair con-

Apply Load

tactor (para 76, 88).

Probable cause

Defective increment or air Replace sitches (fig. 15).

Possible remedy

Variac brushes worn________Check and replace variable

flow switches.

transformer if brushes

Defective relay K-2------- Replace or repair relay

are worn (para 72 and

(para 75, 86).

Thermal switches _________ (para 3c(3) )

79) .

Transformers ------------- (para 79, 82 and 92)

70. Load Drops Suddenly

Rectifiers----------______.(para 39)

Fixed and variable load

(para 86b)

Possible cause

Probable cause

switches.

Contactor (K1) operating Replace contactor (K1)

Wind switches ------------ (para 38a)

improperly.

(para 76).

Section Ill. REMOVAL AND INSTALLATION OF MAJOR COMPONENTS

formers, auto transformers, rectifier, relay,

71. General

This section contains instructions for the re-

contactor, power absorbers, and control trans-

moval and installation of the variable trans-

formers. Refer to figure 13 to remove any