Updates for the Adjust-A-Thrust.

September15th 2003

Ongoing changes to the AAT over the past 3 years have included loosening up the fit between the body and the shuttles, this allowed sand and silt to be washed out of the AAT reducing the incidence of stuck shuttles. We have also moved the location of the inlet orifice to the bottom of the pump. This allows any foreign material to be more easily purged from the unit as the shuttle back shifts. 

Our final change to the AAT is a change to the shoulder bolt that secures the shuttles. The new bolt has a 1/4x20 thread instead of a 10x24. This allows the bolt to be torqued more, reducing the chances of it falling out or breaking the threads. We have only had a couple of customers who have broken shoulder bolts. We have, however, sent out quite a few replacement bolts and shuttles to customer who have lost theirs. 

All AATs we currently have in stock are being modified to accept the new bolt. All production models from now on will also use the new bolt. If you would like your AAT updated to the new bolt, send the unit to us complete. We will modify it to accept the new bolt and ship it back to you with all current hardware and a new T handle wrench (larger) for changing shuttles. The charge for this update is $20 and that includes shipping back to you. If you have any questions, call Bruce at 509-280-5444 or email at  bruce@wetwolf.com

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We developed a new spring that will allow us to run the Adjust-A-Thrust without seals. This spring allows more travel, and longer life. If you purchased an Adjust-A-Thrust before October 6th, 2000, call us to get your unit updated.

One of the problems that we initially had with the Adjust-A-Thrust was springs sacking out or breaking. Due to the huge amount of water pressure a pump puts out, our spring rate had to be quite aggressive to prevent the shuttle from overshifting when the pump pressurizes. We tried 9 or 10 different springs, different rates, materials, preloads, etc. The bottom line was, we were just trying to get to much rate and too much travel out of the spring. We need all the travel we can get, so we had to reduce the rate in order to make the spring survive. 

Then one day out at the lake, I pulled the hydraulic seal out of the body of the Adjust-A-Thrust and installed one of our earlier springs that had proven too weak. With the bleed past the shuttle increased due to the removal of the seal, we were able to make the lighter rate spring work like it was supposed to. We have also changed the taper on all of the 1.25" shuttles, this affects all POL1, POL2, and SKT1 kits sold before October 6th 2000. The new shuttle taper is less aggressive than previous versions and less prone to overshift.

The bottom line is, we now have available an updated spring for anybody that purchased an Adjust-A-thrust before October 6th 2000. If you think you need your shuttles updated as well, call us to verify.