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Doug B

Hey guys,I have a dilemma I need some help with. I have a 1969 GT 14 that I replaced the transmission and pump on. For about 2 weeks afterward everything worked great, but while mowing at a pretty good pace I noticed a shudder and the tractor slowed a little but not bad. The more I rode it the slower it got until it barely moves. What stumps me is the hydraulics are still very strong,as in I can back the 3 point under the bumper of my truck and if you lift the arms all the way up the front wheels of the tractor will clear the ground. Have checked the tow valve and checked the internal filter,but no luck. I have also checked and replaced the forward and reverse bypass springs and the lever is moving the cam to full travel, forward and reverse. Any help would be appreciated.

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953 nut

:WRS:

What filter did you use on the transmission? The correct filter is a Wix 51410 or NAPA 1410, some automotive oil filters look the same but will bypass pressure. The Sundstrand has "Acceleration Valves" for forward and reverse. Is this what you were referring to as bypass springs? Where did you get the springs? One of our vendors has the correct good quality springs for them.  https://wheelhorsepartsandmore.com/product/transmission-acceleration-springs-2-7052-9215-2-7264-9858/ Those valves take a pounding and have some very small passages in them. Remove and clean the acceleration valves and use a new set of springs on them. Drain the oil and replace it along with the filter, could be some contaminants came along with the replacement unit that are causing the problem 

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gt14rider

What transmission did you replace it with?

 Could be a key at your axle hubs or in transmission gears.

Are these the springs you changed 

IMG_20190217_170449551.jpg

IMG_20190217_165413957.jpg

Screenshot_20230204-170643_Gallery.jpg

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Doug B

Thanks for the suggestions on this. The filter is a napa 1410 and I replaced the trans with another 90-2062. I did buy the acceleration springs from the vendor on red square.  Have taken it apart and checked but the springs and valves show no damage. I will try cleaning the ports and a fresh filter and fluid and give it a try. Thanks again guys.

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gt14rider

@Doug Bhave you checked woodruff keys at the axles and hubs. Put a couple marker line across axle and hub and see if they move. 

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gt14rider

Take a look at the sundstrand pump manual hydrogear notes. Also take a look at fig # 9 and #10,#11,#12 could be a stuck valve 

Screenshot_20230411-122417_Samsung Notes.jpg

Screenshot_20230411-122714_Samsung Notes.jpg

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