Loader Bobcat 773. Manual - part 90

FUEL INJECTION PUMP

Checking The Injection Pump

The injection pump contains parts which have a very
close tolerance and its operation has a direct effect on the
performance of the engine.

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

MEL1237 – Adapter Fuel Line
MEL1173A – Pressure Gauge

To check the discharge pressure at the fuel injection
pump, use the following procedure:

Disconnect a high pressure fuel line from the injection
pump. Loosen the other end of the same fuel line so it can
be turned away from the fitting.

Connect the adapter fuel line (Item 1) [A] to the fitting and
connect the pressure gauge (Item 2) [A].

Turn the flywheel to increase the pressure. If the pressure
can not reach the allowable limit, replace the injection
pump assembly.

Fuel Tightness of Pump Element
  Allowable Limit

2133 PSI (14707 kPa)

. . . . . . . . . . . . . . 

Measure the time needed to decrease the pressure from
2133–1990 PSI (14707 –13721 kPa). If the measurement
is less than the allowable limit, replace the delivery valve.

Fuel Tightness of Delivery Valve
  Allowable Limit

5 Seconds

. . . . . . . . . . . . . . . . . . . . . . . . 

Adjusting Shut–Off Linkage

Adjust shut–off linkage for maximum distance of 0.050
inch (1,27 mm) between the lever and stop when solenoid
plunger is seated [B].

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

A

B–08235

2

1

B

B–13704

0.050’’

(1,27 mm)

Lever

Linkage

Stop

773 BICS Loader

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Service Manual

FUEL INJECTION PUMP

Removal And Installation

Clean the area around the injection pump thoroughly.

Do not bend the high pressure fuel injection
tubes when removing or installing them.

I–2029–0289

Disconnect the high pressure fuel lines (Item 1) [A] from
the fuel injectors.

Disconnect the fuel shut–off linkage (Item 1) [B].

Disconnect the fuel inlet hose (Item 1) [C] and the fuel
return hose (Item 2) [C] from the injection pump vent.

Cap the inlets on the injection pump vent where the hoses
were removed [D].

Remove the high pressure fuel lines (Item 1) [D] from the
injection pump.

A

P–04319

1

C

P–04312

2

1

D

P–04316

1

–7–40–

773 BICS Loader

Service Manual

B

P–04306

1

FUEL INJECTION PUMP (Cont’d)

Removal And Installation (Cont’d)

Remove the seven mounting bolts (Item 1) [A] from the
intake manifold (Item 2) [A].

Installation: Tighten the mounting bolts to 16–20 ft.–lbs.
(22–27 Nm) torque.

Remove the intake manifold from the engine.

Installation: Replace the manifold gasket if it is worn or
damaged.

Remove the four mounting bolts (Item 1) [B] and two nuts
(Item 2) [B] from the injection pump.

Installation: Tighten the mounting bolts to 16–20 ft.–lbs.
(22–27 Nm) torque.

Do not attempt to maintain or adjust unless
you are trained and have the correct
equipment.

I–2028–0289

Remove the injection pump (Item 1) [C] and shim(s) from
the engine.

NOTE: The pin (Item 2) [C] located on the control

rack, needs to be installed correctly during
installation. See the following procedure for
correct installation.

A

P–04356

1

2

C

P–04359

1

2

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Service Manual

B

P–04357

1

2

FUEL INJECTION PUMP (Cont’d)

Removal And Installation (Cont’d)

Do not attempt to maintain or adjust unless
you are trained and have the correct
equipment.

I–2028–0289

Installation: Remove the side cover (Item 1) [A] from the
injection pump chamber.

Be sure the spring (Item 1) [B] is located in the injection
pump chamber as shown.

Install the shim(s) (Item 1) [C] on the injection pump
mounting surface. Refer to Timing the Injection Pump
Page 7–43 for information on number of shims used.

Install the injection pump in the engine.

Put the pin (Item 1) [D] on the control rack in the slot of
the fork lever (Item 2) [D] located inside the injection
pump chamber.

If the pin is not correctly installed in the fork
lever, the engine will run over maximum speed,
resulting in serious damage to the engine.

I–2086–1195

A

P–04363

1

C

P–04364

1

D

P–04360

1

2

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773 BICS Loader

Service Manual

B

P–04362

1