Woods Equipment FZ28K Dealer Service, Troubleshooting Hydrostatic Pump, Straight Line Travel

DEALER SERVICE

The information in this section is written for dealer ser- vice personnel. The repair described here requires special skills and tools. If your shop is not properly equipped or your mechanics are not properly trained in this type of repair, you may be time and money ahead to replace complete assemblies.

„Before performing any service or maintenance, lower attachment to ground, turn off power unit engine, remove key, and disconnect battery ground cable (negative -).

„Keep all persons away from operator control area while performing adjustments, service, or maintenance.

CAUTION

„Always wear relatively tight and belted clothing to avoid getting caught in moving parts. Wear sturdy, rough-soled work shoes and protective equipment for eyes, hair, hands, hearing, and head; and respirator or filter mask where appropriate.

TROUBLESHOOTING HYDROSTATIC PUMP

Loss of Power in Transmission

1.Make sure transmission fluid is correct.

2.Make sure hydrostatic pump and fan blades are clean.

NOTE: Overheating can cause loss of power or fluid leaks from excess fluid expansion.

3.Make sure dump valves are tightened down.

NOTE: Transmission fluid can leak by the dump valve if bypass is not tight. Tighten hex head if dump valves are loose.

No Positive Neutral Position

If drive wheels travel forward or reverse when steering handles are in the neutral position (pivoted outward), adjustment of hydrostatic pumps is necessary.

1.Block up power unit frame so both drive wheels are off the ground.

2.Release parking brake.

3.Loosen jam nut (1) on linkage rod as shown in Figure 9.

4. Place steering handles in the neutral position (pivoted outward) and start engine.

5. If drive wheels turn, turn rod out or in until wheel stops.

6. Tighten jam nut.

7. Repeat steps 3 through 6 for other hydrostatic pump control arm.

1

Figure 9. Jam Nut on Linkage Rod

Straight Line Travel

1.Check tire pressure; tires must have equal air pressure.

2.Check travel; drive forward with both steering handles full forward at half throttle.

•If travel is not straight, adjust steering handle stop bolt on opposite side of turn.

•If power unit turns to the left, raise steering stop bolt on the right.

•If power unit turns to the right, raise steering stop bolt on the left.

DP4

Figure 10. Left Side Steering Stop Bolts

20 Dealer Service MAN0875 (2/8/2011)