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Walk Behind Lawn Mowers

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General Product Question

I am having a transmission slippage problem with my just...escalated

General Product Question posted June 14, 2012 by Peter Lazar

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Question:

I am having a transmission slippage problem with my just purchased a HU775H/961450007 high wheel rear drive self propelled walk behind mower. Purchased from Lowes 6/14/12. I adjusted the speed control cable nut so that I am sure it is fully engaging. I even went so far that the levers could hardly be moved (and then backed off). Something in the transmission is slipping such that the lawn mower can not move when on level grass except by human power assist (me pushing). I hope there is a belt tension adjustment. Is there a differential, and could it be slipping? Mower starts fine, mows fine, makes no loading up sounds like the engine is under any additional load when transmission is engaged. If I lift the mower, rear wheels spin. On concrete, I can hold the mower back with one hand without effort. It is engaging, just slipping like crazy.

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Answer

- posted June 17, 2012 by rick gracia
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I am having the same problem, thinking about returning it.
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- posted June 18, 2012 by Peter Lazar
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I fixed it! the drive cable pulls up on an arm on the differential case, which makes a drive pulley on the top (in operating position) pull back. If anything interferes with the drive differential rotating on the shaft until the drive pulley tightens on the drive belt, you get slippage. I followed the owners manual procedure as if to change the belt in order to go in for a look see. (I am an engineer, can't help trying to fix things.) When I finally got the rear axle and drive belt covers off, I found an extraneous spring, hanging on the differential case. Could not find anything onto which it could have hooked on the other end, and with all the cowlings off, the handle pulled the pulley as tight on the belt as one could desire, so I removed the extraneous spring, reassembled, and after cleaning up the oil spill, the drive worked like a charm. Either the cowlings had been misinstalled, or the spring found in the assembly was wedging between the rotating differential and the coverings, preventing full engagement.

two other notes:

Manual says to tip the deck on the side so the carb and air filter is down to work underneath. If you do that, crank oil pours out the engine intake completely filling the air filter and running on the concrete or ground. I suggest considering draining the oil or at least removing the air filter. Alternatively, it is designed to be tipped towards the oil spout to pour out the oil. don't know if the filler cap for the oil will hold but I would think it should be tipped that way (close the side discharge). I had to wash the air filter with detergent and water for some time to get it clean.

The plastic covering over the rear axle and differential could not be removed until the belt cover was removed. Two screws on the top rear of the deck and one big screw on the underside. Their were FOUR screws holding the rear axle cover, not the two shown in the manual. the heads for two of them are hard to access between the rear wheels and the deck. I could get them out but can not seem to get them back in. These two were NOT shown in the manual, and the mower seems to work fine without them, but I am going to have to get a mini socket set (low head space) in order to get them back in.
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