TRAIL WHEEL LINKAGE ADJUSTMENT

Remove all jewelry before handling electrical components.

DISCONNECT THE BATTERY BEFORE YOU REMOVE THIS PART FRON THE TRUCK. SEVERE BURNS CAN RESULT FRO,, CONTACT WITH ELECTRICRL

Jack up the truck and put blocks under the frame at both sides of the drive unit. (The steer handle is at the front of the truck.)

Disconnect the battery.

Do a ground test, using the volt-ohmmeter. With the ohmmeter on the RxlO,OOO scale, connect one ohmmeter lead to the positive (+) side of the truck battery receptacle, and the other ohmmeter lead to the truck frame. Keep a record of the resistance on the PM report form.

Then, connect one ohmmeter lead to the negative (-) side of the truck battery receptacle and the other ohmmeter lead to the truck frame. Keep a record of the resistance on the PM report form.

There should be a minimum resistance of 30,000 ohms for used trucks or 50,000 ohms for new trucks on both tests. Fig. 12704

Fig. 25557

Fig. 25553

Fig. 12705

Check the power cable end crimp (A) and the terminal connections at the contactor panel for tightness.

Check the control wire (B) condition and the control wire terminals for tightness.

Check all contactor assemblies (C) for freedom of movement by pushing the moveable contact tips. Also, check the contact tips for arcing.

NOTICE

If there are indications of severe arcing on the contact tips, remove and replace the tips.

When current draw tests are to be performed, the specific gravity of the battery fluid must be checked. Using a hydrometer, check at least six battery cells. The specific gravity should not be less than 1.250. If less than 1.250, charge the battery. Fig. 25558

Fig. 25559

Fig. 25560

Fig. 17593

Check the battery electrolyte level (especially before charging). The level should be slightly below the lower lip of the vent fill hole. Add water as necessary but DO NOT OVERFILL. Overfilling causes loss of electrolyte.

BATTERY SERVICE MUST BE DONE BY TRAINED PERSONNEL. BATTERY ACID CAN CAUSE SEVERE BURNS AN0 INJURY.

Check the battery vent caps for obstructions. The vent hole must be open at all times.

Connect the ammeter as shown to do the motor current draw tests.

Check the pump motor current draw. Bypass the lift limit switch. Turn the key (if equipped) clockwise to the ON position. Operate the hydraulic control until the system operates in the bypass mode. Check the motor amperage draw and record the reading on the PM report form. On P40, P60 and HWP 40 trucks, the reading should be 200 amps. On HWP 60 trucks, the reading should be 165 amps.

IMPORTANT Do not operate the hydraulic system in the bypass mode with the lift limit switch disconnected any longer than necessary to take a reading.

1

Fig. 12677

Fig. 12913

Fig. 12709

Fig. 23680