Loader Bobcat 773. Manual - part 43

HYDROSTATIC MOTOR 30 SERIES (Cont’d)

Disassembly (S/N 509639899 & Above & S/N
509616505 & Above)

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

Drain the oil from the motor.

Seal all open ports and clean the motor with solvent.

Put a mark across the sections of the motor for correct
assembly [A].

Remove the nine bolts (Item 1) [B] from the motor.

Lift and remove the mounting flange (Item 1) [C] from the
motor.

NOTE: Do not scratch or damage the surfaces of the

motor sections. Always put them on a soft
surface.

Turn the mounting flange over and remove the O–ring
(Item 1) [D] and back–up ring (Item 2) [D].

A

N–00621

C

N–00623

1

D

N–00624

2

1

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773 BICS Loader

Service Manual

B

N–00622

1

HYDROSTATIC MOTOR 30 SERIES (Cont’d)

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

Turn the mounting flange backover and remove the seal
(Item 1) [A] from the mounting flange.

Remove the balancing plate (Item 1) [B] from the gerolor
assembly.

Remove the main drive (Item 1) [C] from the gerolor
assembly.

Remove the two check balls (Item 1) [D] from the gerolor.

NOTE: Care should be taken not to misplace the

check balls.

A

N–00625

1

C

N–00627

1

D

N–00628

1

1

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773 Service Manual #6900092–Hydrostatic System Section Part 1 of 3

B

N–00626

1

HYDROSTATIC MOTOR 30 SERIES (Cont’d)

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

Remove the square cut seal (Item 1) [A] from the gerolor.

Remove the gerolor assembly (Item 1) [B].

NOTE: Care should be taken to keep the gerolor

assembly together.

NOTE: If rollers are removed, put them back in their

original bore.

Carefully turn the gerolor assembly over and remove the
square cut seal (Item 1) [C].

Remove the valve plate (Item 1) [D] from the end cap.

A

N–00629

1

C

N–00631

1

D

N–00632

1

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773 BICS Loader

Service Manual

B

N–00630

1

HYDRAOSTATIC MOTOR 30 SERIES (Cont’d)

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

Remove the square cut seal (Item 1) [A] and small O–ring
(Item 2) [A] from the end cap.

Remove the spring seat (Item 1) [B] and spring (Item 2)
[B].

Remove the poppet and shuttle valve (Item 1) [C].

Turn the end cover over and remove the shuttle valve plug
from the end cover [D].

A

N–00633

1

2

C

N–00635

1

D

N–00636

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B

N–00634

1

2