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Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 5141
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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I am having trouble in cat 312 excavator. 1. The movement of

Customer Question

I am having trouble in cat 312 B excavator.
1. The movement of stick and bucket gets slow in between. I could feel the engine in load. travel and other function are ok.
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  Dan replied 1 year ago.

Hi Sherub, My name is***** is your serial number?

Customer: replied 1 year ago.
Expert:  Dan replied 1 year ago.

Thanks for the info.... What are your current main relief and power-shift pressures at?

Expert:  Dan replied 1 year ago.

Also your pilot pressure? Let me know what the actual pressures currently are

Customer: replied 1 year ago.
1.Main relief at 4227 PSi.
2.power shift at 3124 Psi.
3.pilot pressure at 572 Psi.
Expert:  Dan replied 1 year ago.

Power shift should be higher than Main...... click on these links for some Troubleshooting and test info.


Expert:  Dan replied 1 year ago.


Since this is only effecting two functions it sounds more like one side of the pump has an issue or it is a problem in the control valve..... Check the cycle times of both tracks since the travel is split between pumps.... See if they are equal. Let me know

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