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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
843 No/jerky drive forward or reverse.
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<blockquote data-quote="frogfarmer" data-source="post: 37476" data-attributes="member: 4075"><p>Yeah the newer models have the service port. There was a serial number break on the early machines some had a screen in the port block and a filter and some only had a filter. It looks like you probably swaped the main pump pressure line with the line at the port block that goes to the filter (blown filter). If that was the case the hydros had no charge oil as the hyd pump goes to the control valve then back to the port block then out to the hydros for charge oil. That is a very minimal explanation of the oil flow. The service manual take more than a full page to explain oil flow. A clogged screen in the port block could cause a restriction of charge oil. A restriction at the filter could cause a loss of flow. I would open some fittings and verify flow and pressure in the charge circuit as close as possible to the hydro pumps. A guage and adapter fittings is in order. If you have charge flow and pressure the hydro pumps are the problem. Time to remove and inspect the hydro pumps. If you still think you have hoses crossed I would get a set of manuals for you serial number and study the lines and the flow characteristics. The factory manuals are very useful and money well spent. Keep us informed.</p></blockquote><p></p>
[QUOTE="frogfarmer, post: 37476, member: 4075"] Yeah the newer models have the service port. There was a serial number break on the early machines some had a screen in the port block and a filter and some only had a filter. It looks like you probably swaped the main pump pressure line with the line at the port block that goes to the filter (blown filter). If that was the case the hydros had no charge oil as the hyd pump goes to the control valve then back to the port block then out to the hydros for charge oil. That is a very minimal explanation of the oil flow. The service manual take more than a full page to explain oil flow. A clogged screen in the port block could cause a restriction of charge oil. A restriction at the filter could cause a loss of flow. I would open some fittings and verify flow and pressure in the charge circuit as close as possible to the hydro pumps. A guage and adapter fittings is in order. If you have charge flow and pressure the hydro pumps are the problem. Time to remove and inspect the hydro pumps. If you still think you have hoses crossed I would get a set of manuals for you serial number and study the lines and the flow characteristics. The factory manuals are very useful and money well spent. Keep us informed. [/QUOTE]
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Bobcat Skidsteer Forums
General Bobcat Skidsteer Forum
843 No/jerky drive forward or reverse.
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