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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
642 Hydraulic Pump replacement (Vickers part number)
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<blockquote data-quote="Tazza" data-source="post: 3757" data-attributes="member: 82"><p>You would assume the problem would get better when the fluid warms up, but unfortunatly it doesn't seem to do that... My old 731 has a port block filter and it worked great for say 10-15 mins. then it would howl when i tried to move. After alot of calls to bobcat they told me to change the filter, i did and it works 100% now. It can be changed with no special tools and you don't have to drain your oil. Its located on the left side when looking from the bucket, there should be 3 hoses on the left side, its the middle one. Remove the front hose and put a bung in it. Then remove the middle one and un-screw the large fitting from the port block. There is a spring and a bronze filter behind it. The fitting should have a larger nut size than the other 2 fittings on that side.</p><p>If its still bad, Vickers should be able to provide you with a repair kit too, they will just need the model number of the pump. If possible, you could take the pump in to them if they are close? If you do it that way, you will need to drain your oil as it will go everywhere!</p><p>I still doubt the pump would be the problem, if it was a gear pump i would say sure but vane pumps tend to compensate for any wear because the vanes simply push out further.</p><p>You have nothing to loose by changing the filter ot at least cleaning it and seeing how you go!. It could also be something caught in your relief valve assembly, another member of the forum had this problem, it had a piece of O ring stuck in it causing him a lack of hydraulic pressure.</p></blockquote><p></p>
[QUOTE="Tazza, post: 3757, member: 82"] You would assume the problem would get better when the fluid warms up, but unfortunatly it doesn't seem to do that... My old 731 has a port block filter and it worked great for say 10-15 mins. then it would howl when i tried to move. After alot of calls to bobcat they told me to change the filter, i did and it works 100% now. It can be changed with no special tools and you don't have to drain your oil. Its located on the left side when looking from the bucket, there should be 3 hoses on the left side, its the middle one. Remove the front hose and put a bung in it. Then remove the middle one and un-screw the large fitting from the port block. There is a spring and a bronze filter behind it. The fitting should have a larger nut size than the other 2 fittings on that side. If its still bad, Vickers should be able to provide you with a repair kit too, they will just need the model number of the pump. If possible, you could take the pump in to them if they are close? If you do it that way, you will need to drain your oil as it will go everywhere! I still doubt the pump would be the problem, if it was a gear pump i would say sure but vane pumps tend to compensate for any wear because the vanes simply push out further. You have nothing to loose by changing the filter ot at least cleaning it and seeing how you go!. It could also be something caught in your relief valve assembly, another member of the forum had this problem, it had a piece of O ring stuck in it causing him a lack of hydraulic pressure. [/QUOTE]
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General Bobcat Skidsteer Forum
642 Hydraulic Pump replacement (Vickers part number)
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