Loader Bobcat 773. Manual - part 89

FLYWHEEL

Removal And Installation

Remove the three belt shield clips (Item 1) [A] and
remove the shield from the drive belt housing.

Loosen and remove the drive belt tension pulley (Item 1)
[B].

Remove the drive belt. (Refer to Page 1–1 for drive belt
adjustment procedure.)

Remove the six mounting bolts (Item 1) [C] from the
engine flywheel (Item 2) [C].

Installation: Apply engine oil to the threads and seats
before tightening. Tighten to 72–80 ft.–lbs. (98–108 Nm)
torque.

Remove the flywheel from the engine.

Installation: Be sure to align the hole (Item 3) [C] in the
flywheel with the pin located on the crankshaft.

Reverse the removal procedure to install the flywheel.

Flywheel Ring Gear

The ring gear (Item 1) [D] on the flywheel is an
interference fit. Heat the ring gear enough to expand the
gear. Hit the ring gear evenly around the gear to remove
it from the flywheel.

Clean the outer surface of the flywheel thoroughly so the
new ring gear will fit smoothly onto the flywheel.

Clean the new ring gear and heat it to a temperature of
450

°

–500

°

 F. (232

°

–260

°

C.)

Fit the ring gear on the flywheel and be sure the gear is
seated correctly.

NOTE: Photo’s may be different but the procedure is

the same for all models.

Revised Jan. 99

A

P–04230

1

1

C

P–04234

3

2

1

D

P–04237

1

773 BICS Loader

–7–35–

Service Manual

B

P–04223

1

ENGINE COMPRESSION

Checking

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

MEL10630 – Engine Compression Kit
MEL1352 – Compression Adapter

The engine must be at operating temperature.

Remove the glow plugs. (See Page 7–38.)

Install the correct compression adapter (Item 1) [A] into
the cylinder head.

Connect the compression gauge to the adapter [B].

Make sure the engine speed control is fully backward
(engine idle).

Disconnect the fuel stop solenoid.

Crank the engine with the starter at 200–300 RPM.

If the measurement is below the allowable limit, check the
cylinder, piston ring, top clearance, valve and cylinder
head.

Compression Pressure should be 412–469 PSI
(2840–3233 kPa)

Allowable Limit (minimum) is 327 PSI (2255 kPa)

No more than 10% variance among cylinders.

Push the button on the compression gauge to release
pressure [C].

Connect the fuel stop solenoid.

A

P–04305

1

C

P–04309

–7–36–

773 BICS Loader

Service Manual

B

P–04308

GLOW PLUGS

Checking The Glow Plugs

Disconnect the glow plug cables and leads.

Use an ohmmeter to check the glow plugs [A].

Touch one probe to the end of the glow plug and the other
probe to the body of glow plug [B].

The reading must be between 1 and 2 ohms [A]. If the
resistance is infinite, the coil of the glow plug is broken.

Repeat the procedure for each glow plug.

A

P–04304

773 BICS Loader

–7–37–

Service Manual

B

P–04310

GLOW PLUGS (Cont’d)

Removal And Installation

Disconnect the negative (–) cable from the battery.

Remove the nut (Item 1) [A] from the top of each glow
plug.

Disconnect the engine harness wire (Item 2) [A] from the
glow plug.

Remove the glow plug connecting strap (Item 3) [A].

Loosen and remove the glow plug (Item 1) [B].

Photo [C] shows the glow plug assembly removed from
the engine. Inspect the glow plugs and replace when
necessary.

A

P–04300

1

2

3

C

P–04307

–7–38–

773 BICS Loader

Service Manual

B

P–04302

1