Kawasaki 50ZIII Wheel Loader Repair Manual

Machinery Type: 50ZIII or 50Z3 Wheel Loader
Language English
Manual Details
This manual contains guidelines on repair and maintenance work for the 50ZIII Loader. All explanations, drawings and photographs are current at the time of going to press.

Repair and maintenance work should be carried out systematically and logically after thoroughly reading and understanding this manual to ensure that the shovel loader gives reliable, long-term service.

SHOP SERVICE MANUAL CONTENT:

01 GENERAL OUTLINE
10 FUNCTIONS AND CONSTRUCTION
20 INSPECTION AND ADJUSTMENT
30 DISASSEMBLY AND ASSEMBLY
40 MAINTENANCE STANDARDS
The most important maintenance operations are those related to safety. The points that have special significance from the safety point-of-view are indicated with a A mark in this manual.
Overload relief valve and anticavitation valve
When the steering wheel is not being turned, the oil between the orbitrol and the cylinder is sealed in.

If external force is applied to the steering cylinder under this condition, high pressure would be created in the circuit, and that pressurized oil might cause a ruptured pipe or cylinder, a bent piston rod, or some other problem, unless the oil is allowed to escape.

The overload relief valve directs this pressurized oil to the tank. (Relief pressure setting = 210kg/cm2) (2,987psi)
The set pressure of the overload relief valve can be adjusted by turning the adjusting screw.

When the overload relief valve opens and causes the oil in the cylinder to escape to the tank, the pressure in the opposite section of the cylinder (the rod end of the cylinder in the figure) become negative. When that happens, the anticavitation valve opens and directs oil from the tank into cylinder, canceling the negative pressure in the cylinder.

NOTE: Unless the orbitrol is removed, it is impossible to adjust the overload relief valve.