Toro 2020, 5020, 3020 service manual Lift Cylinder Service, Disassembly

Lift Cylinder Service

1								13
				3
14				4	7
						8
				5
2						9
					6	10
14								11
2						7		12
								11	15
3	5	4	6	10		8	9	13	15
								12

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.

Hydraulic Systems

6. Secure head in the barrel with the retaining ring.

Sand Pro 2020/3020/5020 Page 4 – 41 Hydraulic System (Rev. A)