CHAPTER 4. TROUBLESHOOTING - TM-9-2520-249-34-P0062

TM 9-2520-249-34&P

CHAPTER 4

TROUBLESHOOTING

the normal scope of the using organization. Check the

4-1.

Introduction

troubleshooting section of TM 9-2350-230-20-1, then

a. This chapter contains the troubleshooting

proceed as outlined in this chapter.

information for locating and correcting most of the

d. Troubleshooting, Transmission Alone. If

operating troubles which may develop in the XTG 250-

the transmission alone is received, inspection should be

1A transmission. Each malfunction for an individual

performed to verify the diagnosis made when the

component, unit, or system is followed by a list of tests

transmission was in the vehicle. This inspection, to

or inspections which will help you to determine the

uncover further defects or to determine malfunctions, is

corrective actions for you to take. You should perform

important. Often this is the only means of determining

the tests/inspections and corrective actions in the order

the malfunction without complete disassembly.

listed.

4-3.

Study of Construction, Function Required

b. This manual cannot list all possible

To perform effective troubleshooting, the mechanic

malfunctions that may occur nor all tests or inspections

must have a thorough knowledge of:

and corrective actions. If a malfunction is not listed

a. Construction

Features.

Refer

(except when malfunction and cause are obvious), or is

paragraphs 2-1 through 2-27 for description and function

not corrected by listed corrective actions, notify your

of the transmission components.

supervisor.

b. Functions of Components.

Refer to

4-2.

Purpose of Troubleshooting

paragraphs 2-28 through 2-50 for explanations of

NOTE

hydraulic operations and power flow.

Information in this chapter is for use of Direct

c. Operating Instructions. Refer to TM 9-

Support and General Support maintenance

2350-230-20-1 for instructions on operating the

personnel, in conjunction with and as a

transmission.

supplement to the troubleshooting section of

d. Oil Supply. Refer to paragraph 1-11 for oil

TM 9-2350-230-20-1. (Refer to appendix A.) It

supply information.

provides continuation of instructions where a

e. Adjustments.

Refer to chapter 9 for

remedy in the organizational maintenance

adjustment procedures.

manual refers to supporting maintenance

Oil Pressures.

Refer to table 1-1,

personnel for corrective action.

paragraph 1-12 and to paragraph 9-4c for oil pressures.

a. Damage Prevented.

4-4.

Troubleshooting-Before

Removal

(1) This chapter contains inspection and

Operation

trouble-shooting procedures to be performed while a

a. Preliminary Check. Do not operate the

disabled transmission is still mounted in the vehicle as

vehicle prior to completing the procedures described in

well as after it has been removed.

this paragraph. Refer to paragraph 4-2 for the purpose

(2) Operation of a deadlined vehicle

of these inspections.

without a preliminary examination can cause further

b. Inspect for Oil Leakage. Visually inspect all

damage to the transmission and possible injury to

splitlines, connections, covers, output shafts and plugs

personnel. By careful inspection and troubleshooting,

for oil leaks. Oil leakage at splitlines may be caused by

such damage and injury can be avoided. In addition,

loose bolts or defective gaskets. Tighten bolts (do not

the cause of faulty operation can often be determined

exceed torque specifications) where leakage is found. If

without extensive disassembly.

leaks continue, install new gaskets.

b. Precautions by Inspection. Most of the

c. Re-inspect for Leakage.

Inspect the

inspections are visual inspections and are to be

transmission again for oil leakage after starting the

performed before attempting to operate the vehicle.

vehicle engine. Refer to paragraph 4-5.

These inspections are mainly to determine the condition

d. Check Linkage.

Inspect for loose

and to take precautions to prevent further

components and loose, disconnected or damaged

damage.

linkage. Check linkage and operator's controls for

c. Troubleshooting while Mounted.

The

damage, wear,

troubleshooting performed while the transmission is

mounted in the vehicle is that which is beyond

4-1