Kubota B1220 Workshop Manual page 240

B1220, B1620, B1820, WSM
Valve Assembly and Rack (Piston)
1. Remove the valve housing mounting hex. head screws.
2. Draw out the valve assembly and rack (piston) as a unit.
(When reassembling)
Valve housing mounting
Tightening torque
hex. head screw
Valve Assembly
1. Remove the plug (2).
2. Pull out the worm shaft (3) with sleeve and stub shaft from valve
housing (1).
(When reassembling)
• When tighten the plug, use the PS plug wrench (Refer to G-48).
• Be sure to tighten the plug to specified torque and staking the
plug (2). If the plug is tightened to excessive torque, it may
cause damage to the thrust races and thrust bearings.
Tightening torque Plug
(1) Valve Housing
(2) Plug
Disassembling Valve Housing
1. Loosen the lock nut (6) and remove the adjusting screw (5).
2. Remove the relief spring (3) and the relief valve poppet (2).
(When reassembling)
IMPORTANT
• Do not disassemble the relief valve needlessly, since it has
been factory-adjusted.
• If the relief valve is disassembled, replace the adjusting
screw with new one, and after reassembly, be sure to
adjust the setting pressure, then stake the adjusting screw
with a punch.
Relief pressure adjusting
Tightening torque
screw lock nut
(1) Valve Housing
(2) Relief Valve Poppet
(3) Relief Spring
7-S18
STEERING
40 to 49 N·m
4.0 to 5.0 kgf·m
29 to 36 lbf·ft
9Y1210272STS0023US0
8.9 to 10 N·m
0.90 to 1.1 kgf·m
6.5 to 7.9 lbf·ft
(2) Worm Shaft
9Y1210272STS0024US0
49 to 78 N·m
5.0 to 8.0 kgf·m
37 to 57 lbf·ft
(4) O-ring
(5) Adjusting Screw
(6) Lock Nut
9Y1210272STS0025US0
KiSC issued 07, 2011 A
(EU)