TM 5-3805-293-23-1
0012
Table 1. All-Wheel Drive (AWD) Troubleshooting.
0012
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Active Event or Diagnostic Fault
1. AWD Will Not Engage
1. Connect MSD (WP 0006). Select
Code - Troubleshoot fault codes (WP
All Wheel Drive 120M and check
for any Active event or diagnostic
fault codes.
No Active Event or Diagnostic Fault
Code - Proceed to step 2.
2. Perform Piston Pump Charge
Charge Pressure Low and Will Not
Pressure Test (WP 0043).
Increase With Increase In Engine
Speed - Perform repairs as directed in
Piston Pump Charge Pressure Test
(WP 0043).
Charge Pressures Correct and Will
Increase with Increase In Engine
Speed - Proceed to step 3.
3. Perform Solenoid Valve (AWD
Solenoid Does Not Respond Cor-
rectly - Perform repairs as directed in
Pump Displacement) Test (WP
Solenoid Valve (AWD Pump Displace-
0043).
ment) Test (WP 0043).
Pump Does Not Respond Correctly
- Perform repairs as directed in Sole-
noid Valve (AWD Pump Displace-
ment) Test (WP 0043).
2. Only One Wheel for AWD
1. Perform the following:
System Turns When
a. Remove forward front frame
cover (WP 0224).
Both Wheels Should
b. Relieve hydraulic pressure
Turn. Malfunction Exists
(Steering Circuit) (WP 0218).
in Forward and Reverse
c. Position drain pan under
Directions
machine.
d. Disconnect line and remove
O-ring from C1 orifice fitting
(Figure 1).
e. Disconnect line and remove
O-ring from C2 orifice fitting
(Figure 1).
f.
Inspect for contaminated,
One or Both Orifice Fittings Con-
taminated, Restricted, or Plugged -
restricted, or plugged C1 ori-
Clean or replace as necessary (WP
fice fitting and C2 orifice fitting
0248).
(WP 0248) (Figure 1).
Neither Orifice Fitting Contami-
nated, Restricted, or Plugged -
Install O-ring and connect line on C2
orifice fitting (Figure 1). Install O-ring
and connect line on C1 orifice fitting
(Figure 1). Install forward front frame
cover (WP 0224). Proceed to step 2.