How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Dan Your Own Question
Dan
Dan, Technician
Category: Construction and Road Equipment
Satisfied Customers: 4400
Experience:  17+ yrs. shop and field experience with all major brands of heavy equipment and trucks - 1995 WyoTech graduate.
65405794
Type Your Construction and Road Equipment Question Here...
Dan is online now
A new question is answered every 9 seconds

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

Customer Question

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: 9 months ago.
Category: Construction and Road Equipment
Expert:  Dan replied 9 months ago.

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

Customer: replied 9 months ago.
9GR00214*
Expert:  Dan replied 9 months ago.

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

Expert:  Dan replied 9 months ago.

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

Customer: replied 9 months ago.
1.Main relief at 4227 PSi.
2.power shift at 3124 Psi.
3.pilot pressure at 572 Psi.
Expert:  Dan replied 9 months ago.

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

Schematic

Expert:  Dan replied 9 months 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

Related Construction and Road Equipment Questions