Service Manual

ManualsBrandsToro ManualsTrenchersToro 22970

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116 PW / PY Series

Refer to Figure 9.

Disassembly

1. Prior to removal of the charge pump cover, place

a mark on the cover and end cap for alignment

at assembly.

2. Using a 1/2 inch wrench loosen the charge

pump cover bolts (56) from the end cap (25).

While holding the charge cover in place, remove

the charge cover bolts (56).

3. Remove the charge cover, O-ring (39) and

gerotor items (41). Carefully check for and

remove the charge spring and charge ball (44).

4. For the thru shaft charge pump, remove the shaft

seal (37). After serial date code 3076PXXXX

all thru shaft charge covers will have a retaining

ring (327) holding the shaft seal (37) in place.

Inspection

1. Inspect the charge cover O-ring and running

surfaces for damage. Inspect the spring, check

ball (44), and mating seat in the end cap (25)

for damage or foreign material.

2. Inspect the charge cover bore for damage,

corrosion or wear.

Assembly

For the Thru Shaft charge pump follow steps

1-8. For the Standard charge pump follow steps

3-8.

1. Lubricate the new shaft seal with petroleum jelly.

2. Press the shaft seal into the charge cover. Be

careful not to damage the seal or charge cover

bore.

3. Position the pump with the input shaft down, and

the end cap (25) horizontal. Place the charge

ball (44) in the end cap (25) charge passage so

the ball mates to the end cap (25) charge ball

seat. Place the charge spring (44), on top of the

charge ball.

4. Insert the inner gerotor over input shaft.

5. Align the outer gerotor to t over the inner

gerotor.

6. Insert the O-ring (39) into the groove in the

charge cover.

7. Position the charge cover and O-ring (39) with

the aligning mark on the end cap (25). Place the

charge cover and O-ring with aligning mark on

the end cap. Place the charge cover and O-ring

as one piece over the charge spring (44) and

gerotor assembly. Insure the spring ts into the

charge cover spring retaining groove.

8. Align and insert the charge pump cover bolts

(56) into the end cap (25). Tighten to the correct

torque value. See Table 2, page 110. (Torque

Values.)

REMOVAL, INSPECTION AND

ASSEMBLY OF STANDARD OR

THRU SHAFT CHARGE PUMP

Figure 9. PW / PY Pump Standard or Thru Shaft Charge Pump

NOTE: If the end cap (25) is to be re-

moved from the housing, do not as-

semble the charge pump (40) until the

end cap is installed on the housing.

THRU SHAFT

STANDARD