8-S21
L4400 , WSM
HYDRAULIC SYSTEM
IMPORTANT
■
• Set screw (3) and spool joint 1 (2) are adjusted to very close
accuracy. Do not disassemble them unless necessary.
If disassembled due to unavoidable reasons, be sure to
make the following adjustments before assembling.
■
Spool joint 1 (2)
1. Turn and adjust the spool joint 1 (2) so that the dimension (a)
between the spool joint 2 (1) and the plate 1 (4) is 47.0 to 48.0
mm (1.85 to 1.89 in.).
2. After the adjustment, be sure to adjust the position control
feedback rod.
■
Set screw (3)
1. Set the dimension (b) between the plate 1 (4) and the valve body
to 16.0 mm (0.63 in.)
2. Turn and adjust the set screw (3) so that the clearance (c)
between the set screw (3) and the poppet 2 (5) becomes 0.1 to
0.2 mm (0.0039 to 0.0079 in.).
(When reassembling)
W1017128
(4) Relief Vave
Relief Valve
1. Remove the plug (9), and draw out the spring (5) and the poppet
(4).
2. Take out the valve seat (3).
(When reassembling)
• Take care not to damage the O-rings.
IMPORTANT
■
• After disassembling and assembling the relief valve, be sure
to adjust the relief valve setting pressure.
W1024698
Tightening torque
Plug 1
39.2 to 58.8 N·m
4.0 to 6.0 kgf·m
28.9 to 43.4 ft-lbs
Plug 2
29.4 to 49.0 N·m
3.0 to 5.0 kgf·m
21.7 to 36.2 ft-lbs
Unload plug
39.2 to 58.8 N·m
4.0 to 6.0 kgf·m
28.9 to 43.4 ft-lbs
(1) Spool Joint 2
(2) Spool Joint 1
(3) Set Screw
(4) Plate 1
(5) Poppet 2
(6) Valve Body
a : Dimension
b : Dimension
c : Clearance
Tightening torque
Relief valve plug
49.0 to 69.0N·m
5.0 to 7.0 kgf·m
36.1 to 50.6 ft-lbs
(1) Front Hydraulic Block
(2) Cap
(3) Valve Seat
(4) Poppet
(5) Spring
(6) Adjusting Shim
(7) Washer
(8) O-ring
(9) Plug
KiSC issued 07, 2007 A
Tractor Manuals Scotland - Please Do Not Copy
Tractor Manuals Scotland
