Loader Bobcat 773. Manual - part 41

HYDROSTATIC DRIVE MOTOR (Cont’d)

THE ILLUSTRATIONS MAY NOT EXACTLY SHOW
THE SAME MOTOR YOU ARE WORKING ON, BUT
THE PROCEDURE IS THE SAME.

Disassembly And Assembly (S/N 509639898 & Below
& S/N 509616504 & Below)

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

Remove the four bolts from the motor [A].

Assembly: Tighten the bolts as follows:

50 ft.–lbs. (68 Nm) torque.

Lift the valve housing straight up [B]. If done carefully, the
springs and balanced plate will stay on the valve.

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

NOTE: See Page 3–20 for the correct installation of

the housing and the balance plate.

Remove the O–rings.

Remove the plug at the shuttle valve [C].

Assembly:  Tighten the plug to 200 in.–lbs. (22,6 Nm)
torque.

Remove the spring and shuttle [D].

A

B–08695

C

B–08748

D

B–08742

–3–16–

773 BICS Loader

Service Manual

B

B–08692

HYDROSTATIC DRIVE MOTOR (Cont’d)

Disassembly And Assembly) (S/N 509636898 &
Below & s/N 509616504 & Below) (Cont’d)

Remove the shuttle valve spool [A].

Use a punch, through the housing and remove the
poppet, spring, O–ring and plug from the other side [B].

Assembly: Make sure all parts are cleaned and check for
wear. Assembly as shown [C].

Remove the balance plate [D].

A

B–08741

C

D–01526

C

D

B–08731

773 BICS Loader

–3–17–

Service Manual

B

B–08696

HYDROSTATIC DRIVE MOTOR (Cont’d)

Disassembly And Assembly (S/N 509639898 & Below
& S/N 509616504 & Below) (Cont’d)

Remove the inner seal from the balance plate [A].

Assembly: Put grease on the seal and install as shown
[A].

Remove the outer seal from the balance plate [B].

Assembly: Put grease on the seal and install as shown
[B].

NOTE: When assembling the motor, See Page 3–22

for the timing of the motor when installing
the valve, valve drive and geroler.

Remove the valve [C].

Remove the valve plate [D].

D

B–08730

Balance

Plate

Outer

Seal

Pin

Inner Seal

Pin

Outer

Seal

A

B–03046

B–08733

C

B–08738

–3–18–

773 BICS Loader

Service Manual

B

B–08732
B–03046

Balance

Plate

Outer

Seal

Pin

Inner Seal

Pin

Outer

Seal

HYDROSTATIC DRIVE MOTOR (Cont’d)

Disassembly And Assembly (S/N 509639898 & Below
& S/N 509616504 & Below) (Cont’d)

Remove the valve drive [A].

Remove the geroler [B].

Make sure to keep the rollers in the geroler.

Remove the drive shaft [C].

Remove the O–rings from the housing [D].

D

B–08730

A

B–08729

C

B–08736

773 BICS Loader

–3–19–

Service Manual

B

B–08739