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I am having trouble in cat 312 excavator. 1. The movement of…

Customer Question
Hi I am having trouble in...
Hi
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: 6 years ago.Category: Construction and Road Equipment
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Answered in 6 hours by:
2/17/2016
Mechanic: Dan, Technician replied 6 years ago
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 14,868
Experience: 17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
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Hi Sherub, My name is***** is your serial number?

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Mechanic: Dan, Technician replied 6 years ago

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

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

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Customer reply replied 6 years ago
1.Main relief at 4227 PSi.
2.power shift at 3124 Psi.
3.pilot pressure at 572 Psi.
Mechanic: Dan, Technician replied 6 years ago

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

Schematic

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Mechanic: Dan, Technician replied 6 years ago

Calibration

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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Dan
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Category: Construction and Road Equipment
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