ARIENS ZTR MOWERS

Transmission or Pump making noise

Published 07/23/2014 09:10 AM | Updated 08/18/2016 11:39 AM

What is causing my transmission or pump on my mower to make noise and/or erratic movement?

Due to the effects, air has no efficiency in hydrostatic drive applications, and it is critical that air is removed or purged from the system. Purge procedures must be performed anytime a hydrostatic system has been opened for maintenance, repair, or if any additional oil has been added to the system.

Air trapped in the oil may cause the following symptoms:
1. Noisy operation.
2. Lack of power or drive after short-term operation.
3. High operation temperature and excessive expansion of oil.
4. Bubbles forming in reservoir tank.

Before starting to purge the system, make sure the reservoir is at the proper oil level. If it is not, fill to the manufacturer's specifications as noted in the owner's manual. Position the front of the mower against a wall and raise the rear wheels off the ground. Once the mower is in this position, follow this procedure:

1. With the bypass valve open and the engine running, slowly move the directional control in both forward and reverse directions (5 to 6 times). As air is purged from the unit, the oil level in the reservoir will drop.
2. With the bypass valve closed and the engine running, slowly move the directional control in both forward and reverse directions (5 to 6 times). Check the oil level, and add oil as required after stopping engine.
3. It may be necessary to repeat steps 1 and 2 until all the air is completely purged from the system. When the unit moves forward and reverse at a normal speed and the reservoir oil remains at a constant level, purging is complete.