Toro 3020 Traction Pump Assembly, Make sure all parts are cleaned thoroughly and free, Page 4

Traction Pump Assembly

1. Make sure all parts are cleaned thoroughly and free

of dirt and debris.

11

8 3

2. Secure ball bearing onto shaft with retaining ring.

2

9

Press assembly into variable housing. Snap retaining

ring into housing to secure bearing and shaft (Fig. 49).

IMPORTANT: Make sure not to damage the face sur- face on the cavity side of the variable housing.

3.Position variable housing so the large cavity is up. Press needle bearings into each side of the variable housing. Make sure bearings are flush to 1/64 inch (0.40 mm) below the counter bore for the lip seals (Fig. 49).

4.Place swashplate into variable housing with the counter bore for the thrust plate facing up (Fig. 49).

5.Make sure control shaft is positioned to the proper side of the variable housing before installing. The con- trol shaft should be installed on the side of the pump that will accept the pump control linkage (Fig. 49).

A.Insert control and trunnion shafts through the housing into the swash plate bores.

B.Make sure holes in the swashplate and shafts are aligned properly.

6.Insert new spring pins through the swashplate and into the control and trunnion shafts (Fig. 50).

A.Install first pin until the second pin can be started.

B.Drive both pins in until the last pin is 1/4 inch (6.35 mm) below the swash plate.

C.Repeat steps A and B on the other shaft.

D.Make sure swashplate swings freely and to 15o each way from the center position.

7.Lubricate thrust plate with clean hydraulic fluid. Make sure contact surface for the piston shoes is facing up (Fig. 51).

NOTE: Piston placement in the bores requires no spe- cial orientating.

8.Lubricate cylinder block, spider, and piston assem- blies with clean hydraulic oil. Insert piston assemblies through the spider and into the bores. Make sure spider and spider pivot contact surfaces align properly (Fig. 51).

5

6

71

10

4

Figure 49

1.	Variable housing	7.	Retaining ring
2.	Spring pins	8.	Ball bearing
3.	Control shaft	9.	Retaining ring
4.	Trunnion shaft	10.	Needle bearing
5.	Swashplate	11.	Journal bearing

6.Shaft

	2
4	3
	1/4 INCH (6.4 mm)

1

1	7
6
	5

Figure 50

1.	Spring pin	5.	Variable housing
2.	Swashplate	6.	Needle bearing
3.	Control shaft	7.	Journal bearing

4.Trunnion shaft

2

5

1

3

4

6

Figure 51

1.	Cylinder block	4.	Piston assemblies
2.	Cylinder block assembly	5.	Thrust plate
3.	Spider	6.	Variable housing

Hydraulic System (Rev. A) Page 4 – 54 Sand Pro 2020/3020/5020