Complete workshop & service manual with electrical wiring diagrams for PW200-7E0, PW200-7H, PW200-7K, PW210-1, PW220-7E0, PW220-7H, PW220-7K, PW400MH-6 Wheeled Excavator/Material Handler. It's the same service manual used by dealers that guaranteed to be fully functional and intact without any missing page.
This PW200-7E0, PW200-7H, PW200-7K, PW210-1, PW220-7E0, PW220-7H, PW220-7K, PW400MH-6 Wheeled Excavator/Material Handler service & repair manual (including maintenance, overhaul, disassembling & assembling, adjustment, tune-up, operation, inspecting, diagnostic & troubleshooting…) is divided into different sections. Each section covers a specific component or system with detailed illustrations. A table of contents is placed at the beginning of each section. Pages are easily found by category, and each page is expandable for great detail. The printer-ready PDF documents work like a charm on all kinds of devices.
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TABLE OF CONTENTS
01 GENERAL . . . . . . . . .01-1
10 STRUCTURE, FUNCTION AND MAINTENANCE STANDARD . . . . . . .10-1
20 TESTING AND ADJUSTING . . . . . . . . .20-1
30 DISASSEMBLY AND ASSEMBLY. . . . . . . . .30-1
90 OTHERS. . . . . . . . .90-1
STRUCTURE, FUNCTION, & MAINTENANCE STANDARD WORK EQUIPMENT • SWING PPC VALVE
1) At neutral
Ports A and B of the control valve and ports P1 and P2 of the PPC valve are connected to drain chamber D through fine control hole f in spool (1). (Fig. 1)
2) During fine control (neutral → fine control)
When piston (4) starts to be pushed by disc (5), retainer (9) is pushed; spool (1) is also pushed by metering spring (2), and moves down.
When this happens, fine control hole f is shut off from drain chamber D, and at almost the same time, it is connected to pump pressure chamber PP, so pilot pressure oil from the main pump passes through fine control hole f and goes from port P1 to port A.
When the pressure at port P1 becomes higher, spool (1) is pushed back and fine control hole f is shut off from pump pressure chamber PP. At almost the same time, it is connected to drain chamber D to release the pressure at port P1. When this happens, spool (1) moves up or down so that the force of metering spring (2) is balanced with the pressure at port P1. The relationship in the position of spool (1) and body (10) (fine control hole f is at a point midway between drain hole D and pump pressure chamber PP) does not change until retainer (9) contacts spool (1).
Therefore, metering spring (2) is compressed proportionally to the amount of movement of the control lever, so the pressure at port P1 also rises in proportion to the travel of the control lever. In this way, the control valve spool moves to a position where the pressure in chamber A (the same as the pressure at port P1) and the force of the control valve spool return spring are balanced. (Fig. 2).