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Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 5414
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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Working on a kx 121-2 with no joy stick power or travel

Customer Question

Working on a kx 121-2 with no joy stick power or travel speed Chang replaced valve with solenoids and filters and fluid has power to solenoids
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Curtis B. replied 1 year ago.

Are all function lost? Or just slow? Has the pump drive been checked?

Customer: replied 1 year ago.
No joy stick power no slow speed all mechanical linkage on main valves work like travel front blade thumb control
Expert:  Curtis B. replied 1 year ago.

Excavator has drive pump and hydraulic pump/ Is the smaller hydraulic pump turning?

Customer: replied 1 year ago.
Pump is working
Expert:  Curtis B. replied 1 year ago.

I will opt out. Sorry.

Expert:  Dan replied 1 year ago.

Hi my name is***** you still need help with this? If so let me know the serial number of your machine. Also remove the hydraulic return filter and check for fine metal indicating a pump or component failure occuring. I see you say the pump is working but there still can be a pump issue if all your functions are running slow. The pump output can be less than specs causing your problem and if it is producing metal it can contaminate the rest of the system as well. Have you taken pressures with test gauges yet? If so what are you getting for pressures?