Loader Bobcat 773. Manual — part 121
BICS
™
VALVE (Cont’d)
Removal And Installation
Loosen the six mounting bolts (Item 1) [A] at the BICS
valve.
Remove the mounting bolts (Item 1) [A].
Remove the BICS valve assembly (Item 1) [B] from the
top of the control valve (Item 2) [B].
Installation: Always replace the four large O–rings (Item
3) [B] and small O–ring (Item 4) [B].
Installation: The chart below lists the correct torque
specifications and tightening sequence [C] when
reinstalling the BICS
™
valve assembly to the hydraulic
control valve. Thoroughly clean and dry bolts and threads
in valve. Use liquid adhesive LOCTITE #242.
Step
1
2
3*
Torque
110–130 in.–lbs.
(12,4–14,7 Nm)
190–210 in.–lbs.
(21,5–23,7 Nm)
190–210 in.–lbs.
(21,5–23,7 Nm)
♦
Sequence
1, 2, 3, 4, 5 & 6
*Torque must be 190–210 in.–lbs. (21,5–23,7 Nm) for
every bolt or the complete
♦
sequence must be repeated.
A
N–17271
1
1
C
P–09587
3
1
5
6
2
4
–10–48–
Service Manual
773 BICS Loader
Revised June 01
B
N–17302
1
2
3
3
4
HYDRAULIC CONTROL VALVE
Removal And Installation
Stop the engine. Use the lift lock valve knob to release the
hydraulic pressure. Raise the seat bar.
Lift and block the loader. (See Page 1–1.)
Raise the operator cab. (See Page 1–1.)
Remove the actuators. (See Page 10–29.)
Clean the area around the control valve.
Mark all tubelines for correct installation.
Disconnect the wire harness connectors (Item 1) [A] from
the auxiliary solenoid connectors.
Disconnect the harness connector (Item 2) [A] from the
BICS valve solenoid connector.
Installation: Instll a never modify sta–strap around the
connector (Item 2) [A].
Disconnect the drain hoses (Item 3) [A] from the main
control valve.
Disconnect the outlet tubeline (Item 1) [B] from the
control valve.
Disconnect both tubelines (Item 2) [B] from the auxiliary
section of the control valve.
Disconnect the hose (Item 1) [C] from the lift arm by–pass
control vavle.
Disconnect the tilt tubelines (Item 2) [C].
Disconnect the lift tubelines (Item 3) [C].
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
Raise the lift arms and install an approved lift arm support
device. (See Page 1–1.)
A
N–17819
2
3
4
1
C
N–17821
2
1
3
2
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
Service Manual
–10–49–
773 BICS Loader
Revised Nov. 01
B
N–17820
1
2
HYDRAULIC CONTROL VALVE (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 (Item 2) [A] of the access
cover. Remove the control valve mounting bolt (Item 3)
[A]
from the access cover.
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 control valve mounting bolt (Item 4) [A].
Installation: Tighten the mounting bolt & nut to 18–20
ft.–lbs. (24–27 Nm) torque.
Remove the control valve from the loader.
Reverse the removal procedure to install the control
valve.
A
P–04109
1
2
3
4
C
P–04110
–10–50–
Service Manual
773 BICS Loader
Revised June 01
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
Orificed Load Check Valve/Auxiliary Function
C4
Outlet Fluid Flow
D1
Lift Spool Centering Spring
D2
Tilt Spool Centering Spring
D3
Auxiliary Spool/Centering Springs
E1
Port Relief Valve – 3500 PSI
E2
Anti–Cavitation/Port Relief Valve – 2500 PSI
F1
Anti–Cavitation Valve
F2
Port Relief Valve
G1
Lift Spool End
G2
Tilt Spool End
G3
Auxiliary Spool/Centering Springs
H1
Auxiliary Electric Solenoid
H2
Plug/Port Relief (Optional) – 2500 PSI
H3
Auxiliary Electric Solenoid
MR
Main Relief Valve – 3000 PSI
HYDRAULIC CONTROL VALVE (Cont’d)
Identification Chart
Item
773 AHC Loader
A
MC–02419
MR
G1
G2
G3
H1
D2
D3
D1
H2
F1
F2
C1
E1
E2
C2
C4
A1
A2
A3
B1
B2
B3
H3
C3
Service Manual
–10–51–
773 BICS Loader
Added June 01
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