For Husqvarna Parts Call 606-678-9623 or 606-561-4983
SECTION 4. SERVICE AND MAINTENANCE
NOTE: Any servicing dealer attempting a warranty repair must have prior approval before conducting maintenance of a Hydro-Gear product unless the servicing dealer is a current Authorized
Hydro-Gear Service Center.
EXTERNAL MAINTENANCE
Regular external maintenance of the 310-2400
IZT should include the following:
1. Check the vehicle operator’s manual for the recommended load ratings. Insure the current application does not exceed
load rating.
2. Check oil level in accordance with Figure 4
Page 10.
3. Inspect the vehicle drive belt, idler pulley(s), and idler spring(s). Insure that no belt slippage can occur. Slippage can cause low input speed to the transmission.
4. Inspect the transmission cooling fan for broken or distorted blades and remove any obstructions (grass clippings, leaves, dirt, etc.).
5. Inspect the axle parking brake and vehicle linkage to insure proper actuation and adjustment of the parking brake.
6. Inspect the vehicle control linkage to the directional control arm on transaxle. Also, insure the control arm is securely fastened to the trunnion arm of the transaxle.
7. Inspect the bypass mechanism on the transaxle and vehicle linkage to insure it actuates and releases fully.
SERVICE AND MAINTENANCE
PROCEDURES
All the service and maintenance procedures presented on the following pages can be performed while the 310-2400 is mounted on the vehicle. Any repair procedures as mentioned in the repair section of this manual must be performed after the unit has been removed from the vehicle.
9 310-2400 IZT www.mymowerparts.com
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FLUIDS
The fluids used in Hydro-Gear products have been carefully selected, and only equivalent, or better products should be substituted.
Typically, an engine oil with a minimum rating of 55 SUS at 212°F (100° C) and an API classification of SL is recommended. A 20W-50 engine oil has been selected for use by the factory and is recommended for normal operating temperatures.
FLUID VOLUME AND LEVEL
Recheck the fluid level once the unit has been operated for approximately 1 minute.
Purging may be required. Refer to the purging procedures on page 11.
FLUID CHANGE
Fluid volume information is provided in Table 3.
Certain situations may require additional fluid to be added or even replaced. Refer to Figure 4 for the proper fill port location.
This transaxle is factory filled, sealed and does not require oil maintenance. However, in the event of oil contamination or degradation, oil addition or change may alleviate certain performance problems.
It is essential that the unit exterior be free of debris prior to fluid maintenance. The transaxle must be removed from the vehicle for oil drainage from the top.
CAUTION
Do not overfill.
If you overfill the transaxle while the unit is “cold”, it may overflow as it reaches normal operating temperatures. The oil level should not be above the manufacturer’s suggestions outlined in this manual. This will allow the space needed for the oil to expand as it warms up.
Table 3. Fluid Volumes for the 310-2400 IZT
Fluid Description Volume
20W-50 engine oil 79 fl. oz. (2336 ml.)
FILL PORT
1? " (48.0 mm)
OIL
LEVEL
10
Figure 4. 310-2400 Fluid Level and Fill Port www.mymowerparts.com
310-2400 IZT
For Husqvarna Parts Call 606-678-9623 or 606-561-4983
PURGING PROCEDURES
Due to the effects air has on efficiency in hydrostatic drive applications, it is critical that it be purged from the system.
These purge procedures should be implemented any time a hydrostatic system has been opened to facilitate maintenance or any additional oil has been added to the system.
Air creates inefficiency because its compression and expansion rate is higher than that of the oil normally approved for use in hydrostatic drive systems.
The resulting symptoms in hydrostatic systems may be:
1. Noisy operation.
2. Lack of power or drive after short term operation.
3. High operation temperature and excessive
expansion of oil.
Before starting, make sure the transaxle/ transmission is at the proper oil level. If it is not, fill to the specifications outlined on page
10, Figure 4.
The following procedures should be performed with the vehicle drive wheels off the ground, then repeated under normal operating conditions.
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 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 transaxle moves forward and reverse at normal speed purging is complete.
310-2400 IZT www.mymowerparts.com
11
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RETURN TO NEUTRAL SETTING
WARNING
POTENTIAL FOR SERIOUS INJURY
Certain procedures require the vehicle engine to be operated and the vehicle to be raised off the ground. To prevent possible injury to the servicing technician and/or bystanders, insure the vehicle is properly secured.
WARNING
Do not attempt any adjustments with the engine running. Use extreme caution while inspecting all vehicle linkage!
Follow all safety procedures outlined in the vehicle owner’s manual.
The return to neutral mechanism on the transmission is designed to set the directional control into a neutral position when the operator removes their hands from the control. Follow the procedures below to properly adjust the return to neutral mechanism on the transaxle:
1. Confirm the transaxle is in the operating mode (bypass disengaged). Raise the vehicle’s drive tires off the ground to allow free rotation.
NOTE: It may be necessary to remove the drive tire from the axle hub to access the linkage control and the transaxle return arm.
2. Remove the Original Equipment Manufacturer’s (OEM’s) control linkage at the return arm. Refer to Figure 7.
3. Start the engine and increase the throttle to full engine speed.
4. Check for axle rotation. If the axles do not rotate, go to Step 5. If the axles rotate, go to
Step 6.
5. Stop the vehicle’s engine. Reattach and adjust the OEM linkage to the return arm according to the OEM manual. Recheck according to Step 3 and 4. Stop the vehicle engine. Refer to Figure 7.
6. Note the axle directional movement. Stop the vehicle engine. Loosen the lock down screw until the return arm can be rotated.
Refer to Figure 7 below to make adjustment. In general, rotate the return arm in the direction opposite of axle rotation. If the axle is rotating in the “B” direction, rotate the return arm in the “A” direction, and viceversa. Continue until axle rotation stops.
Tighten the lock down screw. Refer to Table
3 Required Torque Values, Page 6. Recheck according to steps 3 and 4. Stop the vehicle engine. Reattach and adjust the
OEM linkage according to the OEM manual.
Recheck according to steps 3 and 4. Refer to Figure 7.
AXLE ROTATION “B”
AXLE ROTATION “A”
LOCK DOWN SCREW
RETURN ARM
AXLE ROTATION “A”
AXLE ROTATION “B”
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Figure 7. Return to Neutral Control www.mymowerparts.com
310-2400 IZT
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BRAKE MAINTENANCE
COG BRAKE MAINTENANCE
1. Check the brake arm teeth for damage or excessive wear. Replace if necessary.
2. Check for excessive looseness at brake arm pivot point.
DISC BRAKE MAINTENANCE
1. Remove the brake return spring, and then the cotter pin securing the brake castle nut.
2. Insert a 0.020" (0.5 mm) feeler gage between the brake rotor and outer brake friction stator, and then set the brake by tightening or loosening the castle nut.
3. Install a new cotter pin to secure the castle nut, and then install the brake arm bias spring.
FRICTION PACK ADJUSTMENT
The friction pack dampens or holds the operator control lever in its desired position.
Adjustment for the amount of drag or holding force can be made by turning the friction pack nut in or out.
Adjustments should be made in no more than
1/4 turn increments.
Over-tightening will result in difficulty or inability of the operator to move the control lever.
Note: The factory setting for the friction pack is assembly of the nut to 100 in-lbs (11 Nm) torque. The friction pack nut is then backed off per vehicle manufacturer’s specifications.
FRICTION PACK
ADJUSTING NUT
PIVOT
COG PARKING BRAKE
BRAKE ARM TEETH
CONTROL ARM
Figure 6. Friction Pack
BRAKE SETTING LOCATION
310-2400 IZT
DISC PARKING BRAKE
Figure 5. Brake Options www.mymowerparts.com
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