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YARD-MAN 20HP/42'' Model 13BT604G452 with autodrive. Transaxel jerks,slips,and pops in forward. Pulls fine in reverse with no noise. Adjusting transaxel shift linkage did not help. Has new drive belt and pulleys.
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It sounds like you either have a lose belt that is slipping or the fluid in the transaxle is low, or the transaxle is going bad, if it is a hydrostatic transaxle, drain and replace the fluid first, if that fails, you may have a bad seal in the pump or a worn gear
This can be a loose belt that is slipping, low fluid in the transaxle, a bad pump (if hydrostatic transaxle) or worn gears, start by checking belt tension, then replace the fluid and filling to proper level, if that fails, the trans will need to be inspected for internal damage to pump and gears
if this is a MTD rider, (troybilt, yard man, yardmachine,. bolens, cub, etc) the transmission is likely a single gear forward and reverse with a variable speed pulley mechanism with two transmission belts, these trans are prone to failures of the gear clutch which is a dog style clutch with some small teeth that engage the gear plates, these teeth can wear off on one side resulting in the popping or chattering while retaining full functionality for the other direction, this is the gear set inside the transaxle and is usually an indicator of significant wear inside the axle housing itself, usually entire transaxle replacement is the most common and effective repair solution.
it's a square head pipe plug @ base of eng. either right or left side of machine may also have a quik change fitting instead its black plastic w/ yellow cap
my yard machine 42" ride on is making loud grinding noises coupled with slipping and jerking wile driving. could this be a loose belt or is the rear axle breaking ?
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