Loader Bobcat 773. Manual - part 48

HYDROSTATIC PUMP (Cont’d)

Disassembly And Assembly (Cont’d)

Remove the seal carrier and O–ring [A].

Remove the drive shaft [B].

On the other pump, the shaft is held in position by a snap
ring at the bearing. There is no seal carrier on this pump
[C].

Remove the trunnion cover bolts [D].

A

CD–10765

C

CD–10767

D

CD–10768

773 BICS Loader

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Service Manual

B

CD–10766

HYDROSTATIC PUMP (Cont’d)

Disassembly And Assembly (Cont’d)

Assemble: Tighten the trunnion cover bolts to 18–22
ft.–lbs. (24–30 Nm) torque [A].

NOTE: If there are shims installed, do not alter the

thickness when installing the trunnion cover.

Remove the trunnion cover, lip seal and O–ring [B].

Assemble: Wrap the end of the swashplate control shaft
with thin plastic to prevent damage to the lip seal.

Remove the bearing spacer [C].

Remove the bearing shims [D].

NOTE: On later hydrostatic pumps spacers are not

used.

NOTE: On later hydrostatic pumps shims are not

used.

A

CD–10769

C

CD–12459

D

CD–12460

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773 BICS Loader

Service Manual

B

CD–12458

HYDROSTATIC PUMP (Cont’d)

Disassembly And Assembly (Cont’d)

Remove the bearing cup [A].

Remove the tapered roller bearing [B].

NOTE: If the housing, swashplate or bearings are

not replaced, the original shims will be used
again. If any of the parts are replaced, See
Swashplate Pre–load Page 3–50 to determine
the proper shim thickness.

Remove the bolts from the plain trunnion cover [C].

Assemble: Tighten the bolts to 18–22 ft.–lbs. (24–30
Nm) torque.

Remove the O–ring and bearing spacer [D].

A

CD–12462

C

CD–10772

D

CD–12464

773 BICS Loader

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Service Manual

B

CD–12463

HYDROSTATIC PUMP (Cont’d)

Disassembly And Assembly (Cont’d)

Remove the bearing spacer shims [A].

NOTE: Machines S/N 509641107 & Above and S/N

509616590 & Above do not use shims.

Remove the swashplate from the pump housing [B].

Remove the wear plate [C].

Inspection

Clean all the parts in clean solvent and use air pressure
to dry them. DO NOT use cloth or paper towels because
small pieces of material can get into the system and
cause damage.

Check the wear plate for scratches [C].

Check the end of the rotating block for wear and
scratches [D].

Check the valve brass plate on both sides for wear or
damage. Replace if necessary.

A

CD–12465

C

CD–10775

D

CD–10776

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773 BICS Loader

Service Manual

B

CD–12466