Section 53 - ADJUSTMENTSOPERAINGINSTRUCTIONS& REPAIR
5.11HYDRAULIC SYSTEM, PURGING
After replacing or repairing hydraulic system compo- nents, one or both of the wheel drives may not pull properly. This is likely to be caused by air entrapped in the system. If you experience a pulling issue after completing repairs, perform the following procedure to purge the air from one or both of the hydraulic drive systems.
IMPORTANT: WHEN REPLACING THE HYDRAULIC FLUID FILTERS,
1.Locate hydraulic reservoirs underneath operator's seat. After thoroughly cleaning the area around the top of each reservoir, remove filler cap. Bring fluid to prop- er level (1 ½" below the top of the filler neck). With engine off, add SAE 20W50 automotive oil. See Figure
NOTE: In order to raise operator set to access reservoirs, seat must be in rearmost position.
2.Open pressure relief valve on hydraulic pump, turn- ing counter clockwise 2 full turns. See Figure 3.3.
3.Carefully raise the rear of the machine so the wheels are off of the ground. Securely block the machine to prevent it from falling.
4.While seated in the operator's position, start the engine. Place engine speed control in FAST position.
5.Release parking brake and move motion control levers out of the neutral lock position.
6.Slowly move motion control levers to the full for- ward and then to the full rearward positions. Repeat this process 6 times.
7.Stop engine and wait for all rotation to stop before leaving the operator's position.
8.Close pressure relief valve on hydraulic pump, turn- ing clockwise. Tighten snuggly.
9.With pressure relief valve closed, repeat Steps 4 thru 7.
10.Remove blocks and lower rear of machine.
11.Check fluid level in reservoir. Add SAE 20W50 automotive oil as required to bring fluid level to
12.Install and tighten filler cap.
28