Loader Bobcat 773. Manual - part 28

D

P–04097

1

2

CONTROL VALVE (S/N 509460659 & Below, S/N
509616541 & Below) (Cont’d)

Removal And Installation (Cont’d)

Disconnect the tubeline (Item 1) [A] from the rear port of
the tilt section of the control valve.

Disconnect the tubeline (Item 2) [A] from the rear port of
the lift section of the control valve.

Disconnect the tubeline (Item 1) [B] from the front port of
the tilt section of the control valve.

Disconnect the tubeline (Item 2) [C] from the front port of
the lift section of the control valve.

Remove the clevis pin (Item 1) [D] from the tilt spool
linkage.

Remove the clevis pin (Item 2) [D] from the lift spool
linkage.

NOTE: The lift lock valve has been removed for

clarity purpose only.

A

P–04102

1

2

C

P–04111

1

–2–58–

773 BICS Loader

Service Manual

B

P–04107

1

CONTROL VALVE (S/N 509640659 & Below, S/N
509616541 & Below) (Cont’d)

Removal And Installation (Cont’d)

Remove the right rear tire.

Locate the rectangular access cover (Item 1) [A] on the
right side of the loader frame.

Loosen one mounting bolt and remove the other
mounting bolt from the access cover [B].

Rotate the cover to expose the access slot in the loader
[B].

Disconnect the inlet hose from the control valve through
the access slot [C].

Remove the two control valve mounting bolts & nuts.

Remove the control valve from the loader.

Installation: Tighten the mounting bolt & nut to 18–20
ft.–lbs. (24–27 Nm) torque.

Reverse the removal procedure to install the control
valve.

A

P–04109

1

C

P–04110

773 BICS Loader

–2–59–

Service Manual

B

P–04108

A1

Lift Cylinder Base End Restrictor

A2

Tilt Cylinder Base End

A3

Auxiliary Hydraulics

B1

Lift Cylinder Rod End

B2

Tilt Cylinder Rod End

B3

Auxiliary Hydraulics

C1

Load Check Valve/Lift Function

C2

Load Check Valve/Tilt Function

C3

Plug/Auxiliary Function

D1

Lift Spool Detent

D2

Centering Spring Tilt Spool

D3

Auxiliary Spool

E1

Port Relief

E2

Anti–Cav. Valve

Port Relief/Anti–cavitation Valve

(If Equipped)

F1

Anti–Cav. Valve

F2

Port Relief (If Equipped)

G1

Lift Spool

G2

Tilt Spool

G3

Auxiliary Spool

H1

Auxiliary Electric Solenoid

H2

Plug or Port Relief (Optional)

H3

Auxiliary Electric Solenoid

MR

Main Relief Valve

CONTROL VALVE (S/N 509640659 & Below, S/N
509616541 & Below) (Cont’d)

Identification Chart

Item

773 Series

Revised Jan. 99

A

MC–01423

MR

G1

G2

G3

H3

H1

D2

D3

D1

E1

H2

E2

F1

773 SERIES

F2

–2–60–

773 BICS Loader

Service Manual

CONTROL VALVE (S/N 509640659 & Below, S/N
509616541& Below) (Cont’d)

Disassembly And Assembly

The anti–cavitation valve, port relief valves and plugs are
at different locations in the control valve. (Refer to Page
2–62  CONTROL VALVE Identification Chart for the
correct location of the parts for each Model control valve.)

NOTE: THE PHOTO’S MAY NOT SHOW THE EXACT

LOCATION FOR THE PART BEING
REMOVED OR INSTALLED ON THE
CONTROL VALVE, BUT THE PROCEDURE IS
THE SAME.

Mark each valve section and spool so that the parts will
be returned to its original bore during assemble.

Use bolts to fasten the control valve to a work bench for
easier disassemble and assemble.

Load Check Valve

Loosen the load check plug (C port).[A]. (See CONTROL
VALVE Identification Chart, Page 2–60.)

Assemble: Always use new O–ring. Tighten the plug to
35–40 ft.–lbs. (47–54 Nm) torque.

Remove the load check plug [B].

Remove the spring and poppet [C].

When repairing hydrostatic and hydraulic
systems, clean the work area before
disassembly and keep all parts clean. Always
use caps and plugs on hoses, tubelines and
ports to keep dirt out. Dirt can quickly damage
the system.

I–2003–0888

Revised Jan. 99

A

CD–10793

C

CD–10795

773 BICS Loader

–2–61–

Service Manual

B

CD–10794