10.Engine Screen Information Screen Display Details

Does not switch to the low-speed rotation.

It switches to the low-speed rotation but switches to the high-speed rotation during running. The pressure of the Ps port dose not decrease after setting the speed control switch to low speed.

The spring of the 2nd-speed valve is damaged.

No spring is set in the 2nd-speed control valve.

Foreign matter gotten into between the spool and the base plate prevents the spool from returning.

A clogged orifice of the 2nd-speed oil path prevents the pressure in the 2ndspeed piston chamber from being released.

A fatigued spring of the 2nd-speed valve reduces the switchover pressure.

A clogged pilot pipe causes leak from 2nd-speed control valve and the pilot pressure rises to the switchover pressure. Make sure that the pressure of the Ps port is 0.5 MPa or less and review the piping system.

Disassemble the unit to remove the foreign matter and then replace the spring.

Assemble a spring in place.

Disassemble the unit to remove the foreign matter. Check the degree of the damage by following the maintenance procedures. If it is still usable, re-assemble the unit. If it is no longer usable, replace it by using the base plate kit.

Disassemble the unit to remove the foreign matter and re-assemble it.

Disassemble the unit to replace the spring.

Clean the inside of the pipe to remove the foreign matter. In addition, review the piping system.