HYDRAULIC INSTALLATION - Continued
· This work package contains information on locating faults and causes of malfunctions
that may develop in the M9 ACE with HBF-TT system. An alphabetical listing of symptoms
is provided, as well as a symptom index.
· Before you begin troubleshooting, make sure the defect is real. If possible, talk to the
operator or mechanic that reported the problem. Look for any other problems that could
cause the system or component to malfunction, such as a switch or lever in the wrong
position. Refer to Operation Under Unusual Conditions (WP 0008) for correct operating
procedures. Check fluid levels as shown in TM 5-2350-262-10.
· Many faults can be located by a good visual inspection. Look for leaks, loose or corroded
connections, damaged controls, and loose or damaged linkages.
· For specific hydraulic troubleshooting symptoms not found in this manual, refer to
· When working on the hydraulic system, follow the general hydraulic system repair
methods and refer to the general hydraulic system troubleshooting procedures.
· When trying to isolate a fault, review the past maintenance record on the affected vehicle.
Although it doesn't happen often, an incomplete or poorly performed maintenance task
may lead to another problem.
· Wherever the word "lubricate" appears, see Operator Preventive Maintenance Checks
· Malfunctions, test or inspections, and corrective actions are listed/indented according to
the heading at the top of each page.
· Track adjustment is provided by hydraulic pressure from the compensating pump and
controlled by electric current tapped at the UNSPRUNG switch. In the SPRUNG or
UNSPRUNG mode, hydraulic pressure is delivered to the track and blade manifold from
line 9 and returned through line 7 at the left manifold.
· Use these procedures to troubleshoot either left or right track adjusting cylinder. 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 electric circuit (refer to FO-1).
Perform spool and poppet valve checks.
To test spool valve, extend and retract track adjusting cylinders. Track adjusting cylinders
can be extended individually but cannot be retracted individually. However, they can be
To test spool valve, retract and extend track adjusting cylinders.
Have assistant start engine.
To retract left cylinder, lift manual override spool valve Z2 (Figure 1, Item 2).
To retract right cylinder, lift manual override spool valve Z1 (Figure 1, Item 1).
To extend both cylinders, depress manual override spool valves Z1 (Figure 1, Item 1) and Z2
(Figure 1, Item 2) simultaneously.