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 119 of 319

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TM 5-2350-262-20-3

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HIGH-PRESSURE

CIRCUIT

RETURN

SUPPLY

SPRUNG mode provides for a smooth ride up to 30 mph (48km/h) and is used for over the road marches and

parking of the vehicle. Hydraulic pressure is supplied to the front actuators through line 9.

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 of vehicle.

FRONT SUSPENSION RAISE/LOWER CIRCUIT

7

FRONT CORNER (LEFT OR RIGHT) RAISES IN SPRUNG, BUT NOT UNSPRUNG

MODE

COMPONENTS:

1. BUMP STOP CYLINDER

2. NO. 1 ACTUATOR, RIGHT HAND

3. NO. 2 ACTUATOR, RIGHT HAND

4. MAIN HYDRAULIC PUMP

5. RETURN LINE FILTER

6. MAIN ACCUMULATOR

7. HIGH-PRESSURE FILTERS

8. DIRECTIONAL CONTROL

VALVE BANK

9. SPRUNG/UNSPRUNG VALVE

10. HYDRAULIC RESERVOIR

11. COMPENSATING PUMP

12. MAIN MANIFOLD, RIGHT HAND

13. CHECK VALVE