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: Heavy Equipment
Satisfied Customers: 2245
Experience:  19 years Cat, 3 years Case
11546476
Type Your Heavy Equipment Question Here...
catmastertech is online now
A new question is answered every 9 seconds

330c cat excavator. Hyd. Puump blows shaft seal and breaks

Customer Question

330c cat excavator. Hyd. Puump blows shaft seal and breaks coupler. It happened twice
Submitted: 1 year ago.
Category: Heavy Equipment
Expert:  catmastertech replied 1 year ago.

Hello,

What is the full machine serial number?

Have you checked the flywheel housing for out-of round or loose bolts?

Have you checked the pump case pressure?

Did you install the new high pressure seal? See below;

The new seal is a more compliant seal in order to better accommodate the runout of the shaft and the misalignment of the shaft and the seal. The new seal reduces the leaks from the shaft seal.

Adaptable To: The new 247-8977 Seal replaces the former 124-9913 Shaft Seal and the former 177-2482 Shim in the hydraulic pumps on the machines that are listed above. The effectivity of the new seal is listed in Table 1. The new seal is adaptable to the machines that are listed.

Use the procedure that follows in order to install the new seal. The location of the new seal is shown in Illustration 1.

Note: Make sure that the 177-2482 Shim is not installed with the new 247-8977 Seal. The new seal does not require the shim.

Were correct procedures used to install the pump? See attachment below;

Customer: replied 1 year ago.
the proper installation procedure was used. This happened twice.the main problem that has me confused is the coupler braking. Not worn but broke from inside out
Customer: replied 1 year ago.
Vin. Cat0330cccya00546
Expert:  catmastertech replied 1 year ago.

The plastic or the metal hub?

Was the hub aligned properly?

Is the machine being abused or are the relief settings to spec'?

Was case pressure correct?

Whas flywheel housing checked for out-of round or loose bolts?

Expert:  catmastertech replied 1 year ago.

The only letters I have seen about these pumps are for new drive gears and bearing in the pump.

Some issue has also been seen concerning air cavitation. This would be seen as a noisy pump.

No other letters on the drive other than the updated installation procedure.

Expert:  catmastertech replied 1 year ago.

I have not seen this issue so, I will OPT-OUT. Maybe another expert has seen this and can help you further.

Customer: replied 1 year ago.
Thanks

Related Heavy Equipment Questions