Toro Sand Pro 5020 - Manual (Page 91)

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Lift Cylinder Service
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Figure 30
1. O–ring 6. O–ring
2. Barrel 7. Poly–pack
3. Nut 8. O–ring
4. Uni–ring 9. Back–up ring
5. Piston 10. Head
Disassembly
1. Remove oil from the hydraulic cylinder into a drain
pan by slowly pumping the cylinder shaft. Plug both
ports and clean the outside of the cylinder.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on pivot end
only. Do not close vise enough to distort the barrel.
2. Mount hydraulic cylinder in a vice. Remove dust
seal and retaining ring.
3. Extract shaft, head, and piston by carefully twisting
and pulling on the shaft.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vice.
4. Mount shaft securely in a vise by clamping on the
clevis of the shaft. Remove lock nut and piston from the
shaft. Slide head off the shaft.
5. Remove Uni–ring and O–ring from the piston. Re-
move poly–pack, O–ring, and back–up ring from the
head.
11. Dust seal
12. Retaining ring
13. Shaft (w/clevis)
14. Pivot end
15. Clevis
Reassembly
1. Make sure all parts are clean before reassembly.
2. Coat new O–rings, Uni–rings, poly–pack, back–up
ring, and dust seal with with clean hydraulic oil. Install
Uni–ring and O–ring to the piston. Install poly–pack, O–
ring, and back–up ring to the head.
IMPORTANT: Do not clamp vise jaws against the
shaft surface. Protect shaft surface before mount-
ing in a vice.
3. Mount shaft securely in a vise by clamping on the
clevis of the shaft. Slide head onto the onto the shaft.
Install piston and lock nut onto the shaft. Tighten lock
nut. Remove shaft from the vise.
IMPORTANT: Prevent damage when clamping the
hydraulic cylinder into a vise; clamp on pivot end
only. Do not close vise enough to distort the barrel.
4. Mount barrel in a vice.
5. Coat all internal parts with a light coat of clean hy-
draulic oil. Slide piston, shaft, and head assembly into
the barrel being careful not to damage the seals.
6. Secure head in the barrel with the retaining ring.
Hydraulic Systems
Sand Pro 2020/3020/5020 Page 4 – 41 Hydraulic System (Rev. A)