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Husqvarna Group Wheeled products will have a 13-digit serial number (example: 082524B0011613) The first 6 digits are the production date 08/25/24. Husqvarna Group Handheld will normally have 11-digit serial numbers (example: 2022 1802338) 2022 is the production year and the following 2-digits signify the production week of 18. Always document your equipment serial numbers. Refer to the below link for a more comprehensive explanation of serial number formats.
Hydrostatic transmissions use oil, under pressure, to provide movement for the tractor. The fluid is pressurized with a pump inside the transmission. If any air is in the fluid, the pump will try to pressurize air. This condition is known as cavitation, and is detrimental to the pump since it allows the pump top operate dry. When the pump cavitates it is not pressurizing any fluid, so the transmission is not able to provide the movement needed.
If your mower is new, or has been stored for a long period (longer than 2 months) the transmission needs to be purged before use. Also, if you experience loss of drive, or slower response, then the transmission should be purged first.
The following procedure will remove trapped air inside the transmission(s).
IMPORTANT: SHOULD YOUR TRANSMISSION REQUIRE REMOVAL FOR SERVICE OR REPLACEMENT, IT SHOULD BE PURGED AFTER REINSTALLATION BEFORE OPERATING THE TRACTOR.
Step 1- Place the rear of the mower safely onto jackstands on a level surface with engine off and parking brake set.
Step 2- Disengage transmission by placing freewheel control, located at the back of the frame, in the freewheeling position.
NOTE: Mowers with separate pumps and wheel motors the freewheel are activated by turning the bypass valves, one on each pump, two full turns. The oil reservoir needs to be filled to the specifications listed in the owners manual before starting the purge procedure.
Step 3- Sitting in the operators seat(riders), start engine. After the engine is running, move throttle control to slow position. With motion control levers in neutral (N) position, slowly disengage clutch/brake pedal.
Step 4-Move motion control levers to full forward position and hold for five (5) seconds. Move levers to full reverse position and hold for five (5) seconds. Repeat this procedure three (3) times.
NOTE: During this procedure there may be some movement of the drive wheels, but they are not under load. The air is being removed from hydraulic drive system.
Step 5-Move motion control levers to neutral (N) position. Shutoff engine and set parking brake. Check and add oil as needed for units with an oil reservoir.
Step 6-Engage transmission by placing freewheel control into driving position, or by closing the bypass valves on the pumps.
Step 7-Sitting in the operators seat, start engine. After the engine is running, move throttle control to full speed. With motion control levers in neutral (N) position, slowly disengage clutch/brake pedal.
Step 8-Slowly move motion control levers forward, after the tractor moves approximately five (5) feet, slowly move motion control levers to reverse position.
After the mower moves approximately five (5) feet return the motion control levers to the neutral (N) position. Repeat this procedure with the motion control levers three (3) times.
Step 9-Your mower is now purged and now ready for normal operation.
For further information or assistance, we recommend contacting your local authorized service center.
Please review your operators manual for detailed information on purging your transmission.
To ensure proper operation and performance, it is recommend that the transmission be purged before operating
tractor for the first time. This procedure will remove any trapped air inside the transmission which may have developed during shipping of your tractor.
IMPORTANT: SHOULD YOUR TRANSMISSION REQUIRE REMOVAL FOR SERVICE OR REPLACEMENT, IT SHOULD BE PURGED AFTER REINSTALLATION BEFORE OPERATING THE TRACTOR.
1. Place tractor safely on a level surface - that is clear and open - with engine off and parking brake set.
2. Disengage transmission by placing freewheel control in freewheeling position (See “TO TRANSPORT” in
this section of manual).
3. Sitting in the tractor seat, start engine. After the engine is running, move throttle control to slow position. With
motion control lever in neutral position, slowly disengage clutch / brake pedal.
CAUTION: At any time during step 4 there may be movement of the drive wheels.
4. Move motion control lever to full forward position and hold for five (5) seconds. Move lever to full reverse position and hold for five (5) seconds. Repeat this procedure three (3) times.
5. Move motion control lever to neutral position. Shutoff engine and set parking brake.
6. Engage transmission by placing freewheel control in engaged position (See “TO TRANSPORT” in this section of manual).
7. Sitting in the tractor seat, start engine. After the engine is running, move throttle control to half (1/2) speed. With motion control lever in neutral position, slowly disengage clutch/brake pedal.
8. Slowly move motion control lever forward, after the tractor moves approximately five (5) feet, slowly move motion control lever to reverse position. After the tractor moves approximately five (5) feet return the motion control lever to the neutral position. Repeat this procedure with the motion control lever three (3) times.
Your transmission is now purged and now ready for normal operation.