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Curtis B.
Curtis B., Technician
Category: Construction and Road Equipment
Satisfied Customers: 962
Experience:  Technican turned service manager with multiple lines of equipment and rental units.
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The brake does not release on the rotary motor. What do you

Customer Question

The brake does not release on the rotary motor. What do you think the problem is?
JA: What is the complete model and serial number of your machine?
Customer: E70B model Ser # 7yF01735
JA: Are you fixing this yourself? What have you tried so far?
Customer: Yes. I removed the motor and checked the gear box and the motor is fine, the gear is fine but the brake on the motor does not release so I can rotate the cab.
JA: Anything else you want the construction mechanic to know before I connect you?
Customer: No.
Submitted: 10 days ago.
Category: Construction and Road Equipment
Customer: replied 10 days ago.
How much longer before you have a answer for this problem?
Expert:  catmastertech replied 10 days ago.

Hello, I just say your posting and would like to help.

Have you checked the swing brake override switch?

Is your controller in manual (backup mode) or automatic mode?

Have you checked pressure to the swing brake?

Customer: replied 10 days ago.
Where is the swing brake override switch? I don't have the service manual for this machine. Don"t know if it is manual or automatic.
Customer: replied 10 days ago.
can you help?
Expert:  catmastertech replied 10 days ago.

Sorry for the late reply, I am have some PC issues.

I will check for the location and post back in a minute.

Expert:  catmastertech replied 10 days ago.

I am having trouble with a picture.

I can tell you it is on the right console the next to last switch (fifth in the line)(if equipped)

Swing Brake Release Switch - The swing brake will be OFF automatically at the time any implement or swing operations is started. If the brake fails to go OFF, turn ON this switch, and the brake will be released.

The brake should release automatically if the pump controller is in automatic mode. This is the small box behind the seat and to the left side of the cab. (door side) If the switch is in manual mode, you may need to activate the swing brake release switch to allow swing operation.

Expert:  catmastertech replied 10 days ago.

Here is a picture of the swing brake switch.

Expert:  catmastertech replied 10 days ago.

Here is the pump electronic controller shown with the cover removed.

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