Page 53 of Hydrostatic Operator’s Manual:

BELT ADJUSTMENTS

Pump Belt and Final Drive Belt

The pump and final drive belts are adjusted at the same time because the adjustment of one effects the other. The pump belt is tensioned until it has a deflection of 1/4″ to 3/8″ at the center of the belt. The final drive belt is also tensioned to a deflection of 1/4″ to 3/8″.

To adjust, loosen the pump bracket attaching bolts and the final drive idler pulley adjusting nut. Back off the pump adjusting bolt lck nut and tighten the adjusting bolt until the bump belt is properly tenionsed (1/4″ to 3/8″). Tighten the lock nut on the pump adjusting bolt and the pump bracket attaching bolts. Tighten the final drive idler pulley adjusting nut until the belt is properly tensioned (1/4″ to 3/8″).

WARNING: Excessive pump belt tension may cause rapid bearing failure and/or belt deterioration.

ADJUSTMENT NOTE: Start the carriage moving in a forward motion and hold onto the engind shroud handle with one hand and the engine tightener with the other hand. Brace yourself with one foot on the lower portion of the track. In this position, you should be able to just stop the carriage (the final drive belt should slip to allow this). If little effort is needed to stop the carriage, then the final drive belt must be tightened as it is slipping too much. Tighten the final drive idler pulley adjusting nut a few turns and recheck.

Hydro Belt Adjustments << See the manual page and illustration here.

Page 53 of Hydrostatic Operator’s Manual:

MAINTENANCE

Check fluid level and condition at least once a week. The fluid shold be cold when checked. If the fluid is below the “oil level cold” mark, fluid must be added to bring th elevel to the proper mark. If the fluid is milky or dark in color, the pump fluid may be contaminated or the pump could be running hot. In either case, clean the sawdust from the pump cooling fins and replace the fluid. There is no set time for scheduled maintenance intervals. Each case much be evaluated and acted upon on an individual basis. Recommended fluids for this hydrostatic unit are:

International Harvester HY-TRAN
John Deere 303
Case TDF, or an equivalent torque converter fluid.

Ten Weight Hydraulic Oil, Power Steering Fluid. 

REPLACING PUMP FLUID

1.) Remove the pump assembly from the carriage.
2.) Remove reservoir cap and bleed blug. Drain the fluid by turning the pump assembly upside down (rotate both pylleys to remove trapped fluid).
3.) Fill the pump through the reservoir with the recommended fluid, until fluid over flows from the bleed plug hole.
4.) Rotate both pulleys to release any trapped air in the pump.
5.) Refill the pump through the reservoir until fluid begins to overflow at the bleed plug hole.
6.) Install the bleed plug and torque to 2-5 ft. lbs (2.7-6.8 Nm).
7.) Continue to fill the pump through the reservoir until the fluid level us up to the “Oil Level Cold” mark.
8.) Replace the pump assembly onto the carriage and re-adjust the linkage if necessary.

Hydro Pump Maintenance <<< See the manual page and illustration here.