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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
763 hydrostatic rebuild
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<blockquote data-quote="bttpe" data-source="post: 131791" data-attributes="member: 19457"><p>Here's some great news on this machine. We pulled the motor/pump assembly and both drive motors. We disassembled the the hydrostatic pumps and they look very good. The information I found said to look for deep scratches in the wear plates and pistons. We didn't see or feel anything that looked like a deep scratch. So we ordered gaskets and have put them back together. Next we connected the hydraulic lines to the drive motors and the outside pump to the inlet on the hydrostatic pumps. Then added the hydraulic reservoir fed into the outside pump. We also put a tee, ball valve and gauge on one of the hoses. One one pump/motor we get 3000 psi + and the motor runs and see a small leak coming from the shaft area. On the other side we get 2000 psi and a massive leak around the motor shaft. We also found some of the clamping bolts had backed out (that's the problem we think) We now assume this is the problem and have purchased a new drive motor rebuild kit. The orings looked ok but it's too much work to get to this point to go forward without resealing the drive motor. I have to assume that some leaking would be normal. 3000 psi through only a rotating rubber seal - I expect some leaking and think it should flow back through the case drain. I'm working on a video to post to Youtube and will share in a few days/weeks.</p></blockquote><p></p>
[QUOTE="bttpe, post: 131791, member: 19457"] Here's some great news on this machine. We pulled the motor/pump assembly and both drive motors. We disassembled the the hydrostatic pumps and they look very good. The information I found said to look for deep scratches in the wear plates and pistons. We didn't see or feel anything that looked like a deep scratch. So we ordered gaskets and have put them back together. Next we connected the hydraulic lines to the drive motors and the outside pump to the inlet on the hydrostatic pumps. Then added the hydraulic reservoir fed into the outside pump. We also put a tee, ball valve and gauge on one of the hoses. One one pump/motor we get 3000 psi + and the motor runs and see a small leak coming from the shaft area. On the other side we get 2000 psi and a massive leak around the motor shaft. We also found some of the clamping bolts had backed out (that's the problem we think) We now assume this is the problem and have purchased a new drive motor rebuild kit. The orings looked ok but it's too much work to get to this point to go forward without resealing the drive motor. I have to assume that some leaking would be normal. 3000 psi through only a rotating rubber seal - I expect some leaking and think it should flow back through the case drain. I'm working on a video to post to Youtube and will share in a few days/weeks. [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
763 hydrostatic rebuild
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