Installation Instructions

7 STEERING
B1700·B21 00·B2400 WSM, 11770
Axial Play of Ball Nut Assembly
1. Secure the ball nut assembly in a vise.
2. Set a dial indicator with its finger on the worm shaft of the
ball nut assembly.
3. Move the worm shaft axially and measure the play.
4. If the play exceeds the allowable limit, replace the ball nut
assembly.
Factory spec.
OtoO.12 mm
Axial play
of ball nut
o to 0.0047 in.
assembly
Allowable limit
0.100 mm
0.00394 in.
Bl77P212
Clearance between Valve Housing and Spool
1. Measure the valve housing I.D. with a cylinder gauge and the
spool a.D. with an outside micrometer, and calculate this
clearance.
2. Ifthe clearance exceeds the allowable limit, replace the spool
and valve housing as a unit.
II IMPORTANT
.. Check to see if the spool slides smoothly in the valve
housing.
Factory spec.
0.005
to 0.015 mm
Clearance
between 0.00020 to 0.00059 in.
valve housing and
spool
Allowable limit
0.025 mm
0.00098 in.
Spool
a.D. Factory spec.
24.995
to 25.000 mm
0.98406
to 0.98425 in.
Valve housing
J.D. Factory spec.
25.005 to 25.010 mm
0.98445
to 0.98465 in.
Clearance between Valve Housing and Piston
1. Measure the piston a.D. with an outside micrometer and
valve housing I.D. with an inside micrometer, and calculate
this clearance.
2. If the clearance exceeds the allowable limit, replace the
defective parts.
Factory spec.
0.005
to 0.030 mm
Clearance between 0.00020
to 0.00118 in.
valve housing and
piston
Allowable limit
0.06mm
0.0024 in.
Piston
a.D. Factory spec.
9.990
to 10.005 mm
0.39331
to 0.39390 in.
Valve housing
J.D. Factory spec.
10.010to 10.020 mm
0.39409
to 0.39449 in.
7-512