There are four seals that seal the pump. In theory 2 (1 on each end) keep the gear oil out and the other 2 keep the hydraulic fluid in. When you install the new seals, install all 4 so that the lip of the seal is facing in toward the pump gears. This is a comon rpair. Also change the filter and if the pump end plaes are scored, disssemble the coplete unit and wash everything with good hot soapy water. The pump is designed backwards. There is from 20 to 25% more load on the idler gear than on the drive gear. So make sure to change those bearings as well and they can be a pain to change. If your cener plate is cracked the relief valve is set too high or water is getting in the unit and ice is causing the problem. We at one time probaly took care of 200 Olivers with that style pump and if we sold one centerplate a year we were doing good.
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