BRAKES AND AIR SYSTEM-continued -714670048

TM 5-2420-224-34

Table 2-1. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

BRAKES AND AIR SYSTEM (CONT)

17. INTERMEDIATE SPEED SHIFT VALVE WILL NOT OPERATE.

Step 1. Check dual brake gage in cab for indication of 106 psi.

If 106 psi is not indicated, perform Malfunction 16, step 2.

Step 2. Check operation of four-wheel drive/differential lock and crane/backhoe engine

RPM switches.

four-wheel drive/differential lock and crane/backhoe engine

RPM switches do not operate properly, replace accessory air

supply overflow valve (TM 5-2420-224-20).

. If four-wheel drive/differential lock and crane/backhoe engine

RPM switches operate properly, perform Malfunction 9, step 1.

18. TRAILER BRAKES WILL NOT DISENGAGE.

Check trailer brake system as follows:

a. Check dual brake gage in cab for indication of 106 psi.

If 106 psi is not indicated, perform Malfunction 16, step 2.

b. Check that trailer air supply valve is in ON position and trailer hand

brake valve is in OFF position.

Attach 0-200 psi (0-14 bar) pressure gage to test connection (1). Check

0-200 psi (0-14 bar) pressure gage for indication of approximately 106 psi

(7.3 bar).

If 106 psi is not indicated, replace small air pressure tank

overflow valve (2) (TM 5-2420-224-20).