Cub Cadet RZT-S Professional Shop Manual page 40

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RZT-S
A loss of performance in one transmission can be caused by:
1. Rear tires with different circumference or rolling resistance. Air pressure in the rear tires is the most common
cause of this condition.
2. A dragging brake. This will also cause drive system noise and it will create heat at the brake and in the trans-
mission.
3. A partially engaged hydraulic relief rod on one transmission. Note that the EZT transmissions do not contain
relief valves, but lift the pump block off of the surface it seals against, spilling-off hydraulic pressure.
4. A slipping belt. Note that belt path to the right side transmission is under direct tension from the engine crank-
shaft, but has less belt wrap than the left side transmission. The pulley that tensions the drive belt is in the
slack side of the belt path from the right side transmission to the engine crankshaft pulley. There may be a dif-
ference in the way belt problems effect drive to the two transmissions.
5. One transmission that has worn out. Usually the transmissions will wear at similar rates. Wear of one transmis-
sion may be accelerated by fluid contamination, a dragging brake, continual operation with very low air pres-
sure in one rear tire, or some similar issue.
A loss of performance in both transmissions is likely to be caused by a factor that is common to both trans-
missions.
1. Engine performance: While this is not a transmission performance issue, do not overlook engine RPM when
investigating complaints of slow drive speed.
2. Dragging brakes on both transmissions. If both brakes are dragging, pay close attention to the portion of the
linkage that is common to both brakes. It may also be that both brake calipers have stuck. If both calipers are
in a very dirty or very corrosive environment they may both stick.
3. If both hydraulic relief rods are bent or partially engaged, both transmissions will have low power.
4. The belt is common to both transmissions. A slipping belt can cause loss of drive at both transmissions.
4a. A worn belt will slip.
4b. A belt that is wet with water, engine oil, or transmission fluid will slip.
4c. A belt that is loose because the brake linkage is out of adjustment will slip.
4d. Use only the correct part number OEM belt.
5. Worn transmissions will lose performance, particularly when they are warm. Heat and load are the two factors
that accelerate transmission wear.
Heavy load factors include:
5a. Towing heavy things.
5b. Operation on very soft or very hilly terrain.
5c. Grass collection systems that are packed full of wet grass.
5d. Large operator weight.
6. Heat factors include:
6a. Low, contaminated, or improper oil.
6b. Damaged cooling fan.
6c. Mud or debris covering the transmission.
6d. Dragging brake.
6e. Heavy load (see above) increases heat.
All of these factors will contribute to the wear rate of the transmissions. Generally speaking, the transmissions on
Cub Cadet mowers and tractors with SynchroSteer technology hold up slightly better than in lap bar applications
because some of the steering load is taken by the front wheels.
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