Komatsu/Dresser 220-5

[John Sarappa]

Hi, can anyone tellme what these electrical devices are on top of the valve spools? Thanks

 

[John C.]

They are pressure sensors. They provide input to the computer so that it can shift the two speed travel between high and low range automatically.

 

[John Sarappa]

Thanks

 

[John Sarappa]

Do you know where the arm half flow valve is located on the machine?

 

[John C.]

As I recall they are mounted on top of the five spool main control valve.

 

[LACHAU]

Hi, can anyone tell me what these electrical devices are on top of the valve spools? Thanks

What's that spool ?? BOOM, STICK, TRAVEL etc...???

Do you know where the arm half flow valve is located on the machine?

ARM HALF FLOW VALVE = ARM THROTTLE VALVE

 

[John C.]

My mistake, I was referring to the arm half flow solenoid. The labeled hose in the above photo should be the input line from the hydraulic pump.

 

[John Sarappa]

What's that spool ?? BOOM, STICK, TRAVEL etc...???

ARM HALF FLOW VALVE = ARM THROTTLE VALVE

View attachment 218269

View attachment 218268

Is it possible if that spool is stuck that the arm can be weak and slow?

 

[John Sarappa]

By the way, that was the stick/arm spool.

 

[LACHAU]

Is it possible if that spool is stuck that the arm can be weak and slow?

Sure! ARM performance will be slow if it's stuck.

 

[LACHAU]

By the way, that was the stick/arm spool.

I'm not sure! But I think that is "WORK EQUIPMENT OIL PRESSURE SWITCH". It's signal to make engine auto deceleration.

 

[John Sarappa]

Thanks,lot’s of circuits to trace!

 

[Vetech63]

Thanks,lot’s of circuits to trace!

LACHAU makes it easy.

 

[John C.]

The pressure switches on the PPC manifold signal the computer for the auto decal mode. The electrical component in the photo is a pressure transducer. Komatsu at that time made a Tee tool that would plug in between the computer and the machine harness. It had a function that would display the pump pressures sent from those transducers.

 

[LACHAU]

The pressure switches on the PPC manifold signal the computer for the auto decal mode. The electrical component in the photo is a pressure transducer. Komatsu at that time made a Tee tool that would plug in between the computer and the machine harness. It had a function that would display the pump pressures sent from those transducers.

Please!

 

[John Sarappa]

Thanks a million!