Heavy Equipment Repair Questions? Ask an Expert Now.
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;
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?
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.
I have not seen this issue so, I will OPT-OUT. Maybe another expert has seen this and can help you further.