TM-5-2350-262-20-3

ARMORED COMBAT EARTHMOVER (ACE), M9

TECHNICAL MANUAL; UNIT MAINTENANCE MANUAL; VOLUME 3 OF 3; HYDRAULIC TROUBLESHOOTING TEST PROCEDURES

TM-5-2350-262-20-3 - Page 271 of 319

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Track adjustment is provided by hydraulic pressure from the compensating pump and controlled by

electric current tapped at the SPRUNG/UNSPRUNG pressure switch.

In the UNSPRUNG mode, hydraulic

pressure is delivered to the track adjuster manifold from line nine (9) and returned through line seven (7) at the left

manifold.

WARNING

High pressure is present in the M9 hydraulic system.

Do not disconnect any hydraulic

system component unless hydraulic system pressure has been relieved.

Ensure each

hydraulic control lever is moved several times through all positions and hydraulic tank

dipstick is slowly loosened to relieve pressure.

Failure to comply may result in severe

injury or death to personnel.

NOTE

Use these procedures to troubleshoot either left or right front corner.

Front corners

will not lower if the track adjuster cylinders are not retracted.

The hydraulic valves are

equipped with manual operators which can be used to check the hydraulic portion of

the system.

If everything functions by the manual hydraulic operators, the problem

will be in the electric circuit (refer to TM 5-2350-262-20-1).

HIGH-PRESSURE

CIRCUIT

RETURN

SUPPLY

COMPONENTS:

1.

COMPENSATING PUMP

2.

HIGH-PRESSURE FILTER

3.

MAIN ACCUMULATOR

4.

RETURN LINE FILTER

5.

DIRECTIONAL CONTROL

VALVE BANK

6.

HYDRAULIC RESERVOIR

7.

MANIFOLD, LEFT HAND

8.

TRACK ADJUSTING MANIFOLD

ASSEMBLY

10.

TRACK ADJUSTING CYLINDERS

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FRONT CORNER (LEFT OR RIGHT) DOES NOT RAISE OR LOWER IN UNSPRUNG

MODE, SEMI-AUTOMATIC TRACK ADJUSTER (NEW PRODUCTION)

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TM 5-2350-262-20-3