Loader Bobcat 773. Manual - part 45

HYDROSTATIC MOTOR 30 SERIES (Cont’d)

Assembly (S/N 509639899 & Above & S/N 509616505
& Above) (Cont’d)

Install the two check balls (Item 1) [A] in their bores in the
gerotor.

Install the main drive (Item 1) [B] in the gerolor (as
shown).

NOTE: Whenever the main drive is not symmetrical,

the smallest end of the main drive must be
installed into the gerolors.

Mark the case drain hole on the outer ring of the gerolor
(as shown) [C].

Align the case drain holes and install the balancing plate
(Item 1) [D] on the gerolor assembly.

A

N–00655

1

C

N–00657

D

N–00658

1

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B

N–00656

1

HYDROSTATIC MOTOR 30 SERIES (Cont’d)

Assembly (S/N 509639899 & Above & S/N 509616505
& Above) (Cont’d)

Install the seal (Item 1) [A] (as shown).

Install the square cut seal (Item 1) [B], seal (Item 2) [B],
back–up seal (Item 3) [B], seal (Item 4) [B] and back–up
ring (Item 5) [B] in the mounting flange.

Mark the case drain holes on the side of the balancing
plate [C].

Align the case drain port (Item 1) [D] in the mounting
flange with the case drain port in the balancing plate (as
shown).

A

N–00659

1

C

N–00661

D

N–00662

1

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B

N–00660

3

4

5

2

1

HYDROSTATIC MOTOR 30 SERIES (Cont’d)

Assembly (S/N 509639899 & Above & S/N 509616505
& Above) (Cont’d)

Align the two case drain port (Item 1) [A] and install the
mounting flange on the balancing plate.

Be careful not to displace the seals and back–up rings.

Install the nine bolts into the motor. Make sure all the parts
are in correct alignment [B].

1. Tighten the bolts to 45–55 ft.–lbs. (61–75 Nm)

torque as shown in figure [C].

2. Tighten the bolts to 55–65 ft.–lbs. (75 –88 Nm)

torque as shown in figure [C].

NOTE: To prevent damage to the balance plate,

never lift or support the motor by the center
shaft.

A

N–00663

1

C

MC–02230

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B

N–00664

HYDROSTATIC PUMP

Removal And Installation

When repairing hydrostatic and hydraulic
systems, clean the work area before
disassembly and keep all parts clean. Always
use caps and plugs on hoses, tubelines and
ports to keep dirt out. Dirt can quickly damage
the system.

I–2003–0888

Remove the engine/hydrostatic pump assembly from the
loader. (See Page 7–1.)

Remove the steering linkage (Item 1) [A] from the
hydrostatic pump. (See Page 3–8.)

Remove the hydrostatic pump mounting bolt (Item 2) [A]
and washer(s).

NOTE: Washers can be added or removed from the

mounting bolt to adjust the pump drive belt
alignment.

Installation: Tighten the mounting bolt to 65–70 ft.–lbs.
(88–95 Nm) torque.

Remove the hydraulic pump (Item 1) [B] from the
hydrostatic pump. (See Page 2–1.)

Loosen the drive belt tensioner (Item 1) [C] and remove
the drive belt.

Remove the hydrostatic pump drive pulley mounting nut
(Item 2) [C] and washer.

Installation:  Tighten the pump pulley mounting nut to
175–200 ft.–lbs. (237–271 Nm) torque.

Install a puller on the hydrostatic pump drive pulley and
remove the pulley from the pump shaft [D].

A

P–04279

1

2

C

P–04236

1

D

P–04235

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B

P–04275

1