Kobelco K907-II and K907LC-II Excavator Service Manual

TABLE OF CONTENT: Shop manual

INDEX
SPECIFICATIONS
MAINTENANCE
SYSTEM
DISASSEMBLING
TROUBLESHOOTING

Preface Instructions

Read and understand all Warning plates and decal on the machine before Operating, Maintaining or Repairing this machine. The manual has been written for the repair specialist. The serviceman or mechanic may be unfamiliar with many of the systems on this machine. This makes it important to use this manual and be caution when performing service work.

Please go carefully through the Shop Manual of the Excavator before starting any repair work. Use proper lifting procedures when removing any components. Be careful when removing filler caps, breathers and plugs on the machine. Hold a rag over the cap or plug to prevent being sprayed or splashed by liquids under pressure. The danger is even greater if the machine has just been stopped because fluids can be hot.

Use the Shop/Service Manual of the K907-II and K907LC-II Excavator as a reference book and source of information even if you are familiar with Excavator technology. Using the Workshop Manual, the experience construction machine mechanic can carry out any necessary repairs expertly.

Relay

Four-electrode relay is used for the blower OFF relay and compressor relay.
A. Blower OFF relay
The blower OFF relay turns on after receiving the signal from the control amplifier.
When the blower OFF relay turns on, the source voltage is supplied to the blower motor and the blower motor starts running.
B. Compressor relay
The relay ONOFF is tripped by the control amplifier and electronic thermostat control.
C. Relay inspecting items
1. Relay (24-4PE)
2. Coil resistance: 320
3. Specified voltage: DC20V~30V 4. Be careful about the coil side of relay because this relay has polarity.
5. Inspection: Inspect the continuity between 3 and 4 according to the conditions mentioned below.
20~30V applied between terminals 1-2: Continued
20~30V not applied between terminals 1-2: Not continued