Machine moves but has no high speed
Check whether the high/low speed control switch is loose. Check whether the solenoid valve, connector head, and coil are stuck. Check the high-speed circuit pressure.
Bucket cannot dig / poor operation
Check the bucket cylinder and its oil seal. Check whether the multi-way valve spool rod is stuck.
Unable to travel
Check the overload valve. Check for travel motor wear. Check the rear final drive/head oil seal.
Swing is strong in one direction and weak in the other
Check the overload valve of the swing motor. Swap the main hydraulic hoses of the swing motor and check the change. Check the venting of the multi-way valve body.
Machine lacks power
Check and clean the overload valve on the multi-way (multiplex) valve. Check whether the gear pump is leaking; replace the gear pump if necessary. Check whether the hydraulic oil or the hydraulic oil filter element is empty or clogged.
Failure to lift the boom
Check whether the boom cylinder is damaged. Check whether the boom spool in the multi-way valve is in the center position. Check for excessive wear clearance between the boom valve spool and the multi-way valve body. Check for blockage or malfunction in the one-way valve block.
No electrical power at all
Check whether the fuse is blown or loose. Check whether the battery cable is loose. Check the battery relays.
Bucket cannot move / moves very slowly
Check whether the bucket cylinder oil seal is damaged. Check for foreign objects or scratches on the multi-way valve spool rod. Check whether the piping is blocked.
Weak travel on one side
Check the output of the multi-way valve body. Check for travel motor wear. Check for internal leakage due to a damaged oil seal on the rear final drive/head.
How to install the track
First, use the boom and arm of the excavator to lift the machine off the ground. Place the track over the drive sprocket and position the other end on the idler to compress it. Start the machine and slowly walk backwards, using the arm to help guide the track onto the rollers.