Toro 4100-D service manual Disassembly Fig

Disassembly (Fig. 68)

1.Pump oil out of cylinder into a drain pan by SLOWLY moving rod and piston in and out of cylinder bore. Plug ports and clean outside of cylinder.

IMPORTANT: To prevent damage when clamping cylinder in a vise, clamp only on pivotal ends. Use of a vise with soft jaws is recommended.

2.Mount cylinder in a vise so rod end of cylinder is tilted up slightly. Do not close vise so firmly that cylinder tube could become distorted.

3.Loosen head from tube:

A.Use a spanner wrench to rotate head clockwise until the edge of the retaining ring appears in the tube opening.

B.Insert a screwdriver under the beveled edge of the retaining ring to start the retaining ring through the opening.

C.Rotate the head counter--clockwise to remove re- taining ring from tube and head.

4.Grasp end of piston rod and use a twisting and pull- ing motion to carefully extract piston, piston rod and head from cylinder tube.

IMPORTANT: Do not clamp vise jaws against piston rod surface; the piston rod will become damaged.

5.Securely mount piston, piston rod and head into vise and remove piston. Remove head from rod.

6.Remove and discard all seals and O--rings from head and piston.

7.Wash parts in clean solvent. Dry parts with com- pressed air. Do not wipe parts dry with paper towels or cloth. Lint in a hydraulic system will cause damage.

8.Carefully inspect internal surface of barrel for dam- age (deep scratches, out--of--round, etc.). Replace en- tire cylinder if barrel is damaged. Inspect rod and piston for evidence of excessive scoring, pitting or wear. Re- place any damaged parts.

Assembly (Fig. 68)

1.Use a complete repair kit when rebuilding the cylin- der. Put a coating of clean hydraulic oil on all new seals and O--rings.

2.Install new O--rings and seals to the piston and head.

3.Lubricate shaft with clean hydraulic oil. Slide head onto shaft. Install and tighten head. Torque head from 45 to 55 ft--lb (62 to 74 N--m).

4.Put a coating of clean hydraulic oil on all cylinder parts to ease assembly.

5.Slide rod assembly into cylinder tube.

6.Mount steering cylinder in a vise with soft jaws. Se- cure head in barrel:

A.Align retaining ring hole in the head with the ac- cess slot in the tube.

B.Insert the retaining ring hook into the hole and ro- tate head clockwise until the retaining ring is com- pletely pulled into the tube and the ring ends are covered.

C.Apply silicone sealer to tube access slot.

Hydraulic System

Groundsmaster 4100--D Page 4 -- 101 Hydraulic System