Loader Bobcat 773. Manual - part 6

AIR CLEANER SERVICE

Replacing Filter Element

Without BOSS

– Condition Indicator: Replace the large

(outer) filter element only when the red ring shows in the
window of the condition indicator (Item 1) [A].

NOTE: Before replacing the filter element, push the

button on the condition indicator (Item 2) [A].
Start the engine. If the red ring does not
show, do not replace the filter element.

Replace the inner filter every third time the outer filter is
replaced or when the red ring still shows in the indicator
window after the outer filter has been replaced.

With BOSS

: It is important to change the air filter

element only when the service codes (on the BOSS

option display panel) shows the symbols [AF.2] [B].

Open the rear door.

Remove the dust cover wing nut (Item 1) [C].

Remove the dust cover (Item 2) [C].

Remove the wing nut (Item 1) [D] from the large air filter
element.

Revised Jan. 99

P–10308

P–10313

P–10314

–1–14–

773 BICS Loader

Service Manual

MC–02320

•

Replace the inner filter element every third time the
outer filter is replaced.

•

Press the button to remove the red ring in the
condition indicator after the outer filter element has
been replaced. Start the engine and run at full RPM.
If the red ring shows again, replace the inner filter
element.

•

BOSS Only: If the service codes show symbols AF.2
during full engine speed, replace the inner filter
element only after the outer filter element has been
changed.

Remove the inner filter wing nut (Item 1) [B].

Remove the inner filter [C].

Install a new filter and tighten the wing nut.

Close the rear door before operating the loader.

AIR CLEANER SERVICE (Cont’d)

Replacing Filter Element (Cont’d)

Remove the large filter element [A].

NOTE: Be sure all sealing surfaces are free of dirt

and debris.

Install the new filter element and washer and tighten the
wing nut.

Install the dust cover and tighten the wing nut.

Check the air intake hose for damage. Check the air
cleaner housing for damage. Check to make sure all
connections are tight.

Only replace the inner filter element under the following
conditions:

NOTE: Be sure sealing washer is in place on each

wing nut [B].

Revised Jan. 99

P–10312

P–10309

773 BICS Loader

–1–15–

Service Manual

P–10310

FUEL SYSTEM

Fuel Specifications

Use only clean, high quality diesel fuel, Grade No. 2 or
Grade No. 1.

The following is one suggested blending guideline which
should prevent fuel gelling problems:

Stop and cool the engine before adding fuel.
NO SMOKING! Failure to obey warnings can
cause an explosion or fire.

W–2063–0887

Remove the fuel fill cap (Item 1) [A].

Use a clean, approved safety container to add fuel of the
correct specifications. Add fuel only in an area that has
free movement of air and no open flames or sparks. NO
SMOKING! [B].

Install and tighten the fuel fill cap (Item 1) [A].

Fuel Filter

Always clean up spilled fuel or oil. Keep heat,
flames, sparks or lighted tobacco away from
fuel and oil. Failure to use care around
combustibles can cause explosion or fire
which can result in injury or death.

W–2103–1285

Contact your fuel supplier for local recommendations.

Filling the Fuel Tank

Temp. F

)

No. 2

No.1

+15

)

100%

Down to –20

(–29

)

50%

Below –20

(29

)

100%

See the SERVICE SCHEDULE, Page 1–3, for the service
interval when to remove the water from the fuel filter and
when to replace the fuel filter.

Loosen the drain (Item 1) [C] at the bottom of the filter
element to drain water from the filter.

See the SERVICE SCHEDULE, Page 1–3, for the service
interval when to replace the fuel filter.

Remove the filter element (Item 2) [C].

Clean the area around the filter housing. Put oil on the
seal of the new filter element. Install the fuel filter, and
hand tighten.

Remove the air from the fuel system. (See Page 1–17.)

Revised Jan. 99

P–10601

P–10315

–1–16–

773 BICS Loader

Service Manual

WRONG

B–13579

FUEL SYSTEM (Cont’d)

Removing Air From The Fuel System

After replacing the fuel filter element or when the fuel tank
has run out of fuel, the air must be removed from the fuel
system before starting the engine.

Open the vent (Item 1) [A] on the fuel filter housing.

Operate the hand pump (priming bulb) (Item 2) [A] until
fuel flows from the vent with no air bubbles.

Close the vent (Item 1) [A] on the fuel filter housing.

Open the vent (Item 3) [A] on the fuel injection pump.

Operate the hand pump (priming bulb) (Item 2) [A] until
the pump feels solid.

Tighten the vent plug (Item 3) [A].

Start the engine.

It may be necessary to open the vent plug (Item 3) [A]
briefly until the engine runs smoothly.

Diesel fuel or hydraulic fluid under pressure
can penetrate skin or eyes, causing serious
injury or death. Fluid leaks under pressure may
not be visible. Use a piece of cardboard or wood
to find leaks. Do not use your bare hand. Wear
safety goggles. If fluid enters skin or eyes, get
immediate medical attention from a physician
familiar with this injury.

W–2072–0496

Revised Jan. 99

P–10571

773 BICS Loader

–1–17–

Service Manual

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