TM 9-2350-256-34-2
Section II. TROUBLESHOOTING
NOTE
Information in this section is for use by direct support and general support(DS/GS) maintenance personnel in conjunction
with and as a supplement to the troubleshooting section in the organizational maintenance manual. It provides
continuation of instructions where a remedy in the organizational manual refer to DS/GS maintenance personnel for
corrective action.
2-6.
Scope
a.
This section contains troubleshooting or malfunction information and tests for locating and correcting most of
the troubles which may develop in the Recovery Vehicle. Each malfunction or trouble symptom for an individual
component, unit, or system is followed by a list of tests or inspections necessary for you to determine probable causes
and suggested corrective actions for you to remedy the malfunction.
b.
This manual cannot list all possible malfunctions that may occur or all tests or inspections, and corrective
actions. If a malfunction is not listed (except when malfunction and cause are obvious), or is not corrected by listed
corrective actions, you should notify higher level maintenance activity or major unit commander.
c.
Table 2-3 lists the common malfunctions that you may find during the operation or maintenance of the
Recovery Vehicle or its components. You should perform the tests/inspections and corrective actions in the order listed.
NOTE
Before you use this table, be sure you have performed all normal operational checks. If you have a malfunction which is
not listed in this table, notify higher level maintenance activity or major unit commander.
2-6.1.
Adjustment of Main Winch Capability
Refer to paragraph 3-10.1.
2-6.2.
Adjustment of Hoist Winch Capability
Refer to paragraph 3-21.1.
Table 2-3. Troubleshooting
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
MAIN WINCH CIRCUIT (MAIN HYDRAULIC SYSTEM)
CAUTION
Close auxiliary power unit emergency winch control valve for main hydraulic system operation.
1.
MAIN WINCH WILL NOT OPERATE
Step 1.
Attempt operation of hoist winch, boom spade. If hoist winch. boom and spade operate, proceed to step
9. If hoist winch, boom and spade do not operate. proceed to step 2.
Step 2
Inspect mechanical transmission drive shaft. If not rotating, repair or replace. Refer to TM 9-2350-256-
34-1, Medium Recovery Vehicle, M88A1.
Step 3.
Inspect mechanical transmission for broken or restricted hose. Replace mechanical transmission hose.
Refer to TM 9-2350-256-20, Medium Recovery Vehicle, M88A1.
Step 4.
Inspect mechanical transmission output shaft. If not rotating. proceed with mechanical transmission
clutch pressure check. Install pressure gage in mechanical transmission clutch pressure hose.
For location, refer
to TM 9-2350-256-20, Medium Recovery Vehicle, M88A1. With engine operating at 1800
rpm. and power control
valve lever in ON position, normal operating pressure is 150 ± 10 psi
a.
Remove mechanical transmission and main hydraulic pump assembly. Refer to TM 9-2350-256-34-
1, Medium Recovery Vehicle. MS8A1.
b
Replace mechanical transmission Refer to paragraph 3-16.
Step 5.
Test for defective power control valve Remove hose no. 66 from valve. With power control valve level
in ON position and mechanical transmission input shaft rotating, oil shouldflow from valve port.
Replace
power control valve. Refer to TM 9-2350-256-34-1. Medium Recovery Vehicle, MS88A1.
Step 6.
Inspect main hydraulic pump for broken or damaged shaft coupling.
a.
Remove mechanical transmission and main hydraulic pump assembly. Refer to TM 9-2350-256-34-
1, Medium Recovery Vehicle, M88A1.
b.
Repair or replace shaft coupling. Refer to paragraph 3-16.
Change 5 2-6
