Go BottomHydraulic Pump for Yanmar 147D
 | RG
Join Date: Posts: 1 
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2003-03-18 51417
I currently own a Yanmar 147D with a new Koyker 110 loader. The tractor and loader work great! However, I was wondering if anyone knows if a higher capacity hydraulic pump is available for this tractor? Will a hydraulic pump from any of the larger tractors fit?
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| DavesTractor
Join Date: Jul 2003 Posts: 148 Red Bluff, California
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2003-03-18 51433
I'm not sure what other pumps might fit, but keep in mind that smaller cylinders will make the loader operate quicker. It will reduce the lift capacity, but that is a good thing on some small tractors as it helps keep you out of trouble. The new Koyker "80's" have 1.5" rams and a capacity of about 500lbs. 110's come standard with 2", and we usually order them with 1.75". It makes a noticable difference in speed. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2003-03-19 51445
A larger pump also would make more of the engine's power available to the hydraulics at the expense of power to the wheels and pto. There's be a greater chance of stalling the engine while trying to break loader buckets out of a pile while driving into it etc. Operating technique would manage this sort of problem though.
Finding a different pump that had the same mounts, shaft length and gear would be a nightmare unless it could be done through a single parts manual. My NH manual does indicate two different sized pumps used on several tractors in different international models and with various tractor options. Almost anything can be adapted though, but a PTO pump is probably easier.
My main aggravation with loader speed is the dump. I haven't done it, but I know that a bucket control valve with a regenerative fast-dump feature would speed it up quite a bit.
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