SUBSECTION 10C
PROPEL ANTI-STALL CONTROL SYSTEM
3. If the voltage checks are not satisfied, check the cables
Table 10C-3. Propel Control Station Tests
between the anti-stall module and the pump controllers. If
Approximate
the problem still exists, test the throttle setting potentio-
Resistance
meter. If the potentiometer tests satisfactory, replace the
(Ohms)
Condition
Check
anti-stall module.
Pin
Lever at center positron
ENGINE SPEED POTENTIOMETER TEST. To test the en-
Lever approximately
C to D
gine speed potentiometer, proceed as follows:
120
2 forward
Lever approximately
1. Turn the engine off and disconnect the electrical power
120
2 reverse
at junction J1 of the anti-stall module.
80
Pin
*Lever at center position
2. Disconnect the cable running to the engine speed po-
0
*Lever full forward
tentiometer at junction J8 of the anti-stall module.
C to B
120
*Lever full reverse
3. Using an ohmmeter, measure the resistance across pins
120
Lever at center position
Pin
B and D of the cable running to the throttle setting poten-
C to E
tiometer.
13
Pin
Lever at center position
4. With the throttle set at idle, resistance should measure
F to B
approximately 10,000 ohms.
5. With the throttle set at full speed, resistance should
"Meter indication should denote smooth action when
measure approximately 0 ohms.
traveling between control lever Iimits.
6. If the resistance tests are not satisfied, after the cable
running to the engine speed potentiometer has been
6. The propel control station is non-repairable, if the resis-
tance check is not satisfied in every respect, the unit should
checked, replace the engine speed potentiometer.
be replaced.
PUMP CONTROLLER MANUAL INPUT TEST. To manually
ELECTRICAL POWER TO PUMP CONTROLLER TEST. To
test the pump controller, proceed as follows (see Figure
check the electrical power to the pump actuators, proceed
as follows.
NOTE
1. Disconnect the cables connecting the pump controllers,
The manual input lever can be used for emergency
junctrons J6 and J7 at the anti-stall module.
operation of the machine in case of loss of electrical
2. With electrical power on and the anti-stall module
power. Rotation of the manual input lever causes dis-
switch in the manual mode, run voltage checks at junc-
placement of the swashplate, the same as an electri-
cal input.
tions J6 and J7 of the anti-stall module per Table 10C-4.
Make the check with the engine at idle and again at full
1. With the engine running at approximately 1/2 throttle,
speed A dc voltmeter should be used for voltage sensing.
slowly rotate the manual input lever until motion of the ma-
chine is sensed.
Table 10C-4. Electric Power to Pump
2. In the case of no motion with manual input lever rota-
Controller Test
tion, a problem exists in the pump controller, hydrostatic
transmission, or the drive mechanism (see Subsection 9A).
Approximate
Voltage
Condition
Check
(VDC)
Pin
0
Lever at center position
Lever approximately
J6-A to
+ .4
2 forward
J7-A
Lever approximately
- .4
2 reverse
+5.4
Lever full forward
-5.4
Lever full reverse
Pin
Lever at center position
0
Lever approximately
J6-C to
+ .4
2 left
J7-D
Lever approximately
- .4
2 right
+5.4
Lever full left
-5.4
Lever full right
Figure 10C-3. Pump Controller
10C-5
