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 catmastertech Your Own Question
catmastertech
catmastertech, Technician
Category: Construction and Road Equipment
Satisfied Customers: 2245
Experience:  Field service technician for CAT 19 years.
11546476
Type Your Construction and Road Equipment Question Here...
catmastertech is online now
A new question is answered every 9 seconds

Cat d4c lgp s/n 4ls00326 machine will start, hydraulics

Customer Question

Cat d4c lgp s/n 4ls00326 machine will start, hydraulics work, current to brake solenoid, solenoid replaced and brake still not release. thanks, Fred
Submitted: 1 year ago.
Category: Construction and Road Equipment
Expert:  catmastertech replied 1 year ago.

Hello,

Have you checked the pressure to the brakes?

Customer: replied 1 year ago.
not yet, is there a dr connection or do you have to install a fitting
Expert:  catmastertech replied 1 year ago.

You should have a pressure tap under the small access plate to the left of the brake pedal on the floor.

Customer: replied 1 year ago.
basically nothing 5 lbs or less
Expert:  catmastertech replied 1 year ago.

If your foot is on the pedal, that is good. When your foot is off the pedal and the safety lever is up, you should have about 420 psi.

Remember, this is a SPRING applied brake, oil pressure is sent to the brake to release it.

If you pressure is not correct, check the safety valve next.

Customer: replied 1 year ago.
will explore that on my next service call
Expert:  catmastertech replied 1 year ago.

Here is the rest of the testing for the brakes. This should help you check the system.

Customer: replied 1 year ago.
thanks
Expert:  catmastertech replied 1 year ago.

You're welcome. If you need more help, please feel free to ask for me.

Related Construction and Road Equipment Questions