Loader Bobcat 773. Manual - part 56

MOTOR CARRIER (Cont’d)

Shaft Seal Replacement (Cont’d)

Installation: Install MEL1420 Carrier Seal Tool over the
carrier seal [A].

Hit the tool with a hammer until the seal is fully seated on
the carrier shaft [A].

Photo [B] shows the motor carrier seal correctly installed.

NOTE: Before reinstalling the hydrostatic motor,

check the plug (Item 1) [B] located in the
center of the carrier shaft for tightness. If the
plug becomes loosened, case drain
lubrication oil from the hydrostatic motor
can leak into the chaincase.

A

P–04150

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773 BICS Loader

Service Manual

B

P–04149

1

Raise the loader lift arms and install an approved lift arm
support device. (See Page 1–1.)

Lift and block the loader. (See Page 1–1.)

Raise the loader operator cab. (See Page 1–1.)

Drain the fluid from the chaincase. (See Page 4–8.)

Remove the engine speed control. (See Page 7–1.)

Remove the control panel. (See Page 3–1.)

Remove the lift lock valve. (See Page 2–1.)

Remove the traction lock assembly. (See Page 2–1.)

Remove the center chaincase cover. (See Page 4–9.)

Remove the front chaincase cover. (See Page 4–10.)

Remove the front axle and sprocket. (See Page 4–19.)

Remove the hydrostatic motor. (See Page 3–1.)

Remove the parking brake disc (Item 1) [A]. (See Page
4–4.)

Remove the six motor carrier mounting bolts (Item 2) [A]
from the inside of the chaincase.

Installation: Tighten the motor carrier mounting bolts to
125–140 ft.–lbs. (170–190 Nm) torque.

For ease of removal, fasten the front drive chain
(previously removed) to the chaincase as shown [B].

Tip the end of the sprocket toward the rear of the loader
and remove the rear drive chain (Item 1) [B] from the
sprocket.

Slide the motor carrier out of the chaincase [C].

Installation: Check the motor carrier gasket (Item 1) [C]
for wear or damage and replace if necessary.

Use one of the motor carrier mounting bolts (Item 1) [D]
and install partially into one mounting hole on the carrier.

Fasten a chain hoist to the bolt on the motor carrier and
remove the carrier from the loader.

Reverse the removal procedure to install the motor
carrier.

MOTOR CARRIER (Cont’d)

Removal And Installation

Never work on a machine with the lift arms up
unless the lift arms are secured by an approved
lift arm support device. Failure to use an
approved lift arm support device can allow the
lift arms or attachment to fall and cause injury
or death.

W–2059–0598

Revised Jan. 99

A

P–04152

1

2

C

P–04165

1

D

P–04168

1

773 BICS Loader

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Service Manual

B

P–04167

1

MOTOR CARRIER (Cont’d)

Disassembly

It is necessary to locate or fabricate a press tool for this
procedure. Refer to photo [A] for the correct dimensions
of the tool needed.

A hydraulic press, slide hammer with puller end and snap
ring pliers are also recommended for this procedure.

Remove the motor carrier shaft seal. (See Page 4–11.)

Remove the snap ring (Item 1) [B] from the motor carrier
shaft using the snap ring pliers.

Put the motor carrier in the hydraulic press as shown [C].

Use 2–1/4 inch driver tool and press the sprocket shaft
out of the motor carrier housing [C].

NOTE: The outer bearing will now be free from the

sprocket shaft.

Remove the housing from the press and install a bearing
puller (Item 1) [D] on the sprocket shaft.

Put the assembly in the hydraulic press. Use the same
tool driver and remove the bearing (Item 2) [D] from the
shaft.

A

MC–02102

2.530’’ I.D. Diameter
(64,26 mm)

3.000’’ O.D. Diameter
(76,2 mm)

7.000’’
Length
(177,8 mm)

C

P–04176

D

P–04365

1

2

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773 BICS Loader

Service Manual

B

P–04372

1

MOTOR CARRIER (Cont’d)

Disassembly (Cont’d)

Fasten the carrier motor housing to the work surface
securely with the inner bearing race (Item 1) [A] facing up.

Install the slide hammer with puller end (Item 2) [A] on the
bottom side of the bearing race.

Remove the bearing race from the carrier housing [A].

Put the motor carrier housing in the hydraulic press as
shown [B].

Use a 3–7/8 inch driver tool and press the outer bearing
race from the housing.

Check all parts for wear and damage. Replace the
bearing race when new bearings are to be installed.

Assembly

Put the motor carrier housing in the press as shown [C].

Use 4–5/16 inch driver tool and press the new inner
bearing race into the motor carrier housing [C].

Press the bearing race in until it is fully seated in the
carrier housing.

Turn the motor carrier housing over as shown [D].

Use 4–5/16 inch driver tool and press the new outer
bearing race into the motor carrier housing [D].

Press the bearing race in until it is fully seated in the
carrier housing.

A

P–04373

1

2

C

P–04369

D

P–04368

773 BICS Loader

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Service Manual

B

P–04370