Lift Cylinder Repair - Toro Groundsmaster 300 Series Service Manual

Lift Cylinder Repair (Fig. 34)
Pump the oil out of the cylinder into a drain pan by
moving the piston back and forth.
1. Wash the lift cylinder in solvent and dry it thoroughly.
2. Mount the lift cylinder vertically in a vise so the shaft
end of the cylinder is facing up.
3. Push the head (Item 5) into the barrel (Item 13)
approximately 3/4 inch. Remove the retaining ring
(Item 4).
4. Grasp the large end of the shaft and use a twisting
and pulling motion to carefully extract the piston
(Item 11), shaft (Item 2) and head (Item 5) from the
cylinder bore.
5. Remove the cylinder from the vise.
6. Securely mount the piston, shaft and head assembly
into the vise so that the large nut (Item 12) is easily
assessable for removal.
7. Remove the large nut from the end of the shaft.
8. Remove the piston and head from the shaft.
9. Inspect the head, shaft and piston for excessive
scoring, pitting or wear. Replace any defective parts.
2
1
Repairs
6
5
9
4
8
3
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10. Use a new seal kit (Items 3, 6 - 10) to replace all
O-rings, seals and back-up rings.
IMPORTANT: The dust seal lips must point outward;
the seal must have the O-ring portion facing
towards the inside of the cylinder.
11. The rod end is retained with 75 - 90 ft-lbs torque and
with Loctite Retaining Compound (very strong).
12. Tighten the piston head locknut to 75 - 90 ft-lb.
Remove the piston, head and shaft assembly from the
vise.
NOTE: Coat all O-rings, seals, wiper rings and the
interior bore of the cylinder with a light coating of
hydraulic oil to ease assembly.
13. Install the barrel into the vise in the vertical position
described in step 3.
14. Slide the shaft, piston and head assembly into the
barrel, aligning the ports for the hydaulic lines as
needed.
15. Install the retaining ring to secure the head in the
barrel. Pull up on the piston to make sure the retaining
ring is in place.
12
6
7
6
11
10
7
Figure 34
13
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Groundsmaster 300 Series