TABLE 4
TM 5-3805-258-24-1
9 5 0 B O P E R A T O R ’ S S T A T I ON
E L E C T R I C A L T R O U B L E S H O O T I NG
Brake Oil Pressure Indicator
There are two brake oil pressure switches in the brake oil pressure indicator
circuit. The two switches are wired in series (wired one after the other in a
circuit). If either switch opens, the indicator will turn ON. When the travel of
the foot lever goes too far on this brake system, the 7V5647 Brake Oil Pressure
Switch, opens and turns ON the indicator.
1. Remove the two wires from the 7V5647 Brake Oil Pressure Switch on the
master cylinder for the rear brakes. Put both wires to machine ground. If the
indicator turns OFF, the problem is in one of the switches or its harness.
Indicator Turns OFF
Indicator Does NOT Turn OFF
Go to Step 2.
Problem is in operator’s panel or the harness from
the panel to the switches.
2. Check for continuity across each of the 7V5647 Brake Oil Pressure Switches.
Continuity
No Continuity
Go to Step 3.
Replace the switch.
3. Check for continuity from the 7V5647 switch on the master cylinder for the
front brakes to machine ground.
Continuity
No Continuity
There is an open in the wire that goes from the front
Repair or replace the harness or connect a wire from
master cylinder switch to the rear master cylinder
the switch ground connection to machine ground.
switch. Repair or replace the harness.
Hydraulic Temperature, Engine Coolant Temperature, Or
Transmission Oil Temperature Indicator
Follow the instructions given at the first of the section on the monitoring system,
to make sure the system is cool enough for the indicator to turn OFF. If the
indicator does NOT turn OFF, make a check of the electrical system as follows:
1. Disconnect the control wire from the temperature switch of the indicator that
is ON. (See TABLE 4).
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