Troubleshooting. Hydro-Gear 310 2400

The 310-2400 is a self-contained unit designed for the transfer and control of power. It provides an infinitely variable speed range between zero and maximum in both forward and reverse modes of operation. The transaxle normally will not require servicing during the life of the vehicle in which it is installed.

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SECTION 3. TROUBLESHOOTING

WARNING

Do not attempt any servicing or adjustments with the engine running.

Use extreme caution while inspecting the drive belt assembly, and all vehicle linkage!

Follow all safety procedures outlined in the vehicle owner’s manual!

In many cases problems with the 310-2400 IZT are not related to a defective transaxle, but are caused by slipping drive belts, partially engaged bypass valves, and loose or damaged control linkages. Be sure to perform all operational checks and adjustments outlined in Section 4, Service and Maintenance before assuming the unit is malfunctioning. Table 2 below provides a troubleshooting check list to help determine the cause of operational problems.

Table 2. 310-2400 Troubleshooting Checklist

Possible Cause Corrective Action

UNIT OPERATES IN ONE DIRECTION ONLY

Control linkage bent or out of adjustment

Drive belt slipping or pulley damaged

Repair or replace linkage, Page 9

Repair or replace drive belt or pulley, Page 9

VEHICLE DOES NOT DRIVE/TRACK STRAIGHT

Vehicle tires improperly inflated

Control linkage bent, loose or out of adjustment

Bypass partially engaged

Refer to vehicle manufacturer suggested pressure

Repair, adjust or replace vehicle linkage

Adjust bypass linkage

Oil level low or contaminated oil

Excessive loading

Brake setting incorrect

Loose parts

Bypass assembly sticking

Air trapped in hydraulic system

UNIT IS NOISY

Fill to proper level or change oil, Page 10

Reduce vehicle loading, Page 9

Adjust brake to proper setting, Page 13

Repair or replace loose parts

Repair or replace valve or linkage

Purge hydraulic system, Page 11

Engine speed low

Control linkage bent or out of adjustment

Brake setting incorrect

Drive belt slipping or pulley damaged

Oil level low or contaminated oil

Excessive loading

Bypass assembly sticking

Air trapped in hydraulic system

UNIT HAS NO/LOW POWER

Adjust to correct setting

Repair or replace linkage, Page 9

Adjust brake to proper setting, Page 13

Repair or replace drive belt or pulley, Page 9

Fill to proper level or change oil, Page 10

Reduce vehicle loading, Page 9

Repair or replace valve or linkage

Purge hydraulic system, Page 11

Debris buildup around transaxle

Brake setting incorrect

Cooling fan damaged

Oil level low or contaminated oil

Excessive loading

Air trapped in hydraulic system

UNIT OPERATING HOT

Clean off debris, Page 9

Adjust brake to proper setting, Page 13

Repair or replace cooling fan

Fill to proper level or change oil, Page 10

Reduce vehicle loading, Page 9

Purge hydraulic system, Page 11

Damaged seals, housing, or gaskets

Air trapped in hydraulic system

TRANSAXLE LEAKS OIL

Replace damaged component

Purge hydraulic system, Page 11

310-2400 IZT www.mymowerparts.com

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Key features

Infinitely variable speed range
Self-contained unit
Zero and maximum speed
Forward and reverse operation

Frequently asked questions

The 310-2400 transaxle normally will not require servicing during the life of the vehicle in which it is installed.

A 20W-50 engine oil with an API classification of SL is recommended.

Possible causes include a bent or out-of-adjustment control linkage, a slipping or damaged drive belt, or a partially engaged bypass valve.

Purge the system by moving the directional control in both forward and reverse directions 5 to 6 times with the bypass valve open and the engine running, then repeat with the bypass valve closed.