Loader Bobcat 773. Manual - part 36

LIFT LOCK BY–PASS VALVE

Removal And Installation (S/N 509640659 & Below,
S/N 509616541 & Below)

Install jackstands under the rear corners of the loader.

Raise the loader operator cab. (See Page 1–1.)

Drain the hydraulic fluid reservoir. (See Page 2–84.)

The lift lock by–pass valve (Item 1) [A] is located under

the right side of the control panel.

Remove the engine speed control. (See Page 7–1.) This
procedure is optional.

Control panel removal is optional. (See Page 3–1.)

If you choose not to remove the engine speed control and

control panel, the lift arm by–pass control knob (Item 1)
[B] will need to be removed from the control panel.

Hold the by–pass control knob (Item 1) [B] and loosen the

jam nut (Item 2) [B] on the by–pass valve shaft.

Remove the by–pass control knob and jam nut from the

valve shaft.

Remove the rubber washer (Item 3) [B].

Disconnect the five tubelines from the lift lock by–pass

valve (Item 1) [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

Never work on a machine with the lift arms up
unless the lift arms are secured by an approved
lift arm support device. Failure to use an
approved lift arm support device can allow the
lift arms or attachment to fall and cause injury
or death.

W–2059–0598

Added Jan. 99

Raise the loader lift arms and install an approved lift arm

support device. (See Page 1–1.)

A

P–03992

1

C

P–04095

1

–2–90–

773 BICS Loader

Service Manual

B

P–03991

2

1

3

LIFT LOCK BY–PASS VALVE (Cont’d)

Removal And Installation (S/N 509640659 & Below,
S/N 509616541 & Below) (Cont’d)

Remove the two mounting bolts and nuts (Item 1) [A] from
the lift lock by–pass valve.

Installation: Tighten the two mounting bolts and nuts to
180–200 in.–lbs. (21–23 Nm) torque.

Refer to Page 8–1 for lift arm by–pass control inspection
procedure.

Remove and replace the by–pass valve mounting bracket
(Item 1) [B] if necessary.

Reverse the removal procedure to install the lift lock
by–pass valve in the loader.

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

Disassembly And Assembly (S/N 509640659 &
Below, S/N 509616541 & Below)

Remove the by–pass valve (Item 1) [C] from the valve
block. Inspect the by–pass valve for damage and replace
if necessary.

Remove the check valve (Item 2) [C] from the valve block.
Inspect the check valve for damage and replace if
necessary.

Inspect the hydraulic fittings on the valve block for
damage and replace if necessary.

Added Jan. 99

A

P–04093

1

1

B

P–04094

1

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–2–91–

Service Manual

C

P–04096

1

2

TILT LOCK VALVE

Removal And Installation (S/N 509640659 & Below,

S/N 509616541 & Below)

Place jackstands under the rear corners of the loader.

Raise the loader operator cab. (See Page 1–1.)

Drain the hydraulic fluid reservoir. (See Page 2–84.)

The tilt lock valve (Item 1) [A] is located on the right side
of the loader frame below the fuel fill hose (Item 2) [A].

Loosen the hose clamp (Item 3) [A] and disconnect the
fuel fill hose (Item 2) [A]. Position the hose out of the way
of the tilt lock valve.

Disconnect the P2 port tubeline (Item 1) [B] and the B1
port tubeline (Item 2) [B] from the tilt lock valve.

Never work on a machine with the lift arms up
unless the lift arms are secured by an approved
lift arm support device. Failure to use an
approved lift arm support device can allow the
lift arms or attachment to fall and cause injury
or death.

W–2059–0598

Remove the Do Not Modify sta–strap (P/N 6665527) from
the electric solenoid connector (Item 3) [B].

Installation: Install a new Do Not Modify sta–strap (P/N
6665527) on the electric solenoid connector (Item 3) [B].

Disconnect the X port tubeline (Item 1) [C] from the tilt
lock valve.

Revised June 01

Raise the loader lift arms and install an approved lift arm
support device (See Page 1–1).

AVOID INJURY OR DEATH

Do not modify the electrical wiring connected
to the tilt lock valve solenoid. Service work for
the tilt lock valve should be performed by a
qualified technician. Use only genuine
Bobcat/Ingersoll–Rand  parts if repair to the
BICS

™

is necessary.

W–2166–0100

A

P–03993

3

2

1

C

P–04103

1

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

–2–92–

773 BICS Loader

Service Manual

B

P–04106

2

3

1

TILT LOCK VALVE (Cont’d)

Removal And Installation (S/N 509640659 & Below,
S/N 509616541 & Below) (Cont’d)

Disconnect the P1 port tubeline (Item 1) [A] from the tee
fitting located on the bottom of the tilt lock valve. Use a
tubeline wrench to remove the tubeline.

Remove the tilt lock valve mounting bolt (Item 2) [A],
spacer (Item 3) [A] and nut.

Disconnect the PP port hose (Item 1) [B] from the tilt lock
valve.

Disconnect the PT port hose (Item 1) [C] from the tee
fitting on the bottom of the tilt lock valve.

Remove the tilt lock valve from the loader.

Installation: Connect the PT port hose (Item 1) [C] to the
tee fitting as shown. Before connecting the PT port
tubeline (Item 1) [D], place the tilt lock valve in its normal
mounting position to check the routing of the PT port hose
(Item 1) [C]. Tighten the hose when the routing is correct.

Replace the tilt lock valve in its normal mounting position
and install the PT tubeline (Item 1) [D]. Use a tubeline
wrench to install the tubeline.

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

Added Jan. 99

B

P–04113

1

D

P–04117

1

A

P–04112

2

1

3

773 BICS Loader

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Service Manual

C

P–04116

1