Loader Bobcat 773. Instruction - page 9

SPARK ARRESTOR MUFFLER

Cleaning Procedure

See the SERVICE SCHEDULE Page 1–3 for service
interval for cleaning the spark arrestor muffler.

Do not operate the loader with a defective exhaust
system.

Stop the engine. Open the rear door and rear grill.

Remove the plug (Item 1) [A] from the bottom of the
muffler.

Start the engine and run for about ten seconds while a
second person, wearing safety glasses, holds a piece of
wood over the outlet of the muffler.

This will force contaminants out through the cleanout
hole.

Stop the engine. Install and tighten the plug. Lower the
rear grill and close the rear door.

This loader is factory equipped with a U.S.D.A.
Forestry Service approved spark arrestor
muffler. It is necessary to do maintenance on
this spark arrestor muffler to keep it in working
condition. The spark arrestor muffler must be
serviced by dumping the spark chamber every
100 hours of operation.

If this machine is operated on flammable forest,
brush or grass covered land, it must be
equipped with a spark arrestor attached to the
exhaust system and maintained in working
order. Failure to do so will be in violation of
California State Law, Section 4442 PRC.

Make reference to local laws and regulations for
spark arrestor requirements.

I–2022–0595

Revised Jan. 99

A

P–10322

1

When the engine is running during service, the
steering levers must be in neutral and the
parking brake engaged. Failure to do so can
cause injury or death.

W–2006–0284

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773 BICS Loader

Service Manual

When an engine is running in an enclosed area,
fresh air must be added to avoid concentration
of exhaust fumes. If the engine is stationary,
vent the exhaust outside. Exhaust fumes
contain odorless, invisible gases which can kill
without warning.

W–2050–1285

Stop engine and allow the muffler to cool before
cleaning the spark chamber. Wear safety
glasses or goggles. Failure to obey can cause
serious injury.

W–2011–1285

Never use machine in atmosphere with
explosive dust or gases or where exhaust can
contact flammable material. Failure to obey
warnings can cause injury or death.

W–2068–1285

TIRE MAINTENANCE

Wheel Nuts

See the SERVICE SCHEDULE Page 1–3 for the service
interval to check the wheel nuts. The correct torque is
105–115 ft.–lbs. (142–156 Nm) torque [A].

Tire Rotation

Check the tires regularly for wear, damage and pressure.
(See SPECIFICATIONS Page 9–1 for the correct tire
pressure.)

Rear tires usually wear faster than front tires. To keep tire
wear even, move the front tires to the rear and rear tires
to the front [B].

It is important to keep the same size tires on each side of
the loader. If different sizes are used, each tire will be
turning at a different speed and cause excessive wear.
The tread bars of all the tires must face the same
direction.

Recommended tire pressure must be maintained to avoid
excessive tire wear and loss of stability and handling
capability. Check for the correct pressure before
operating the loader.

Tire Mounting

Tires are to be repaired only by an authorized person
using the proper procedures and safety equipment. Tires
and rims must always be checked for correct size before
mounting. Check rim and tire bead for damage.

The rim flange must be cleaned and free of rust. The tire
bead and rim flange must be lubricated with a rubber
lubricant before mounting the tire, avoid excessive
pressure which can rupture the tire and cause serious
injury or death. During inflation of the tire, check the tire
pressure frequently to avoid over inflation.

Do not inflate tires above specified pressure.
Failure to use correct tire mounting procedure
can cause an explosion which can result in
injury or death.

W–2078–1285

Inflate tires to the MAXIMUM pressure shown
on the sidewall of the tire. DO NOT mix brands
of tires used on the same loader.

I–2057–0794

Revised Jan. 99

A

P–10628

773 BICS Loader

–1–27–

Service Manual

B

B–09976

FINAL DRIVE TRANSMISSION (CHAINCASE)

Checking And Adding Oil

The chaincase contains the final drive sprockets and
chains and uses the same type of oil as the
hydraulic/hydrostatic system. (See SPECIFICATIONS
Section Page 9–1.)

To check the chaincase oil level, use the following
procedure:

Drive the loader on a level surface. Stop the engine.

Remove the plug (Item 1) [A] from the front of the
chaincase housing.

If oil can be reached with the tip of the your finger through
the hole the oil level is correct.

If the level is low, add oil through the check plug hole until
the oil flows from the hole. Install and tighten the plug.

Removing Oil From The Chaincase

To drain the oil from the chaincase, remove the cover
(Item 1) [B] which is installed over the drain plug at the
rear of the chaincase.

Installation: Tighten the cover bolts to 10–20 ft.–lbs.
(24–27 Nm) torque.

Remove the drain plug (Item 1) [C] and drain the oil into
a container.

NOTE: When installing the drain plug into the

chaincase, always use a NEW drain plug
gasket.

Revised June 01

A

P–03870

1

C

P–01619

1

–1–28–

773 BICS Loader

Service Manual

B

P–01616

1

DRIVE BELT

Adjusting The Drive Belt Equipped With The Fixed
Drive Idler

The tools listed will be needed to do the following
procedure:

MEL1405 – Bar
MEL1406 – Spring Scale

See the SERVICE SCHEDULE Page 1–3 for the service
interval.

To adjust the drive belt between the engine flywheel and
the hydrostatic pump pulley, use the following procedure:

Stop the engine. Open the rear door.

Disconnect the negative (–) battery cable.

Remove the belt shield holddown clips (Item 1) [A].

Remove the belt shield [B].

Use the correct tools to adjust the idler tensioner and the
drive belt.

MEL1405 – Belt Tension Bar
MEL1406 – Spring Scale

The pulley tensioner is located between the flywheel and
pump pulley.

Loosen the bolt (Item 1) [C] at the pulley tensioner.

Use the end of the belt tensioning tool (MEL1405) to move
the tension pulley down (Inset) [C].

Tighten the bolt (Item 1) [C] at the pulley tension bracket
to 25–28 ft.–lbs. (34–38 Nm) torque..

Install the Belt Tension Bar (MEL1405) on the drive belt
[D].

The pin (Item 1) [D] must be pulled tight against the
engine drive pulley.

Make a mark on the cast flange just below the tool handle
(Item 2) [D].

Revised Jan. 99

A

P–03967

1

C

P–04070

P–04232

1

D

P–04227

2

1

773 BICS Loader

–1–29–

Service Manual

B

P–03969

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