SHOP MANUAL
Paragraphs 22-23
Model 1710 Offset
22,
POWER STEERING GEAR.
The steering gear assembly is mounted
on the front axle support frame. To re-
move steering gear, first remove clamp
bolt from steering shaft universal joint,
then unbolt and remove steering wheel
and shaft assembly. Scribe reference
marks on pitman arm and end of sector
shaft, then remove pitman arm. Discon-
nect hydraulic lines, remove mounting
bolts and remove steering gear.
To disassemble, remove front cover
(1-Fig. 38). Remove nut (2), thrust
bearing assemblies and control valve
(16) assembly from worm shaft. Be
careful not to lose centering pistons (9)
and springs (8 and 10). Remove relief
valve assembly (11 through 15) from
control valve if necessary.
Remove cap nut (34) and jam nut (33)
from sector shaft adjusting screw. Re-
move cap screws attaching side cover
(31) to housing, then turn adjusting
screw clockwise to force cover off the
housing. Withdraw sector shaft (26)
from the housing.
Remove snap ring (47), then push
shaft (39), ball nut (40) and end cover
(46) out of gear housing. The ball nut
and shaft are available only as a set and
should not be disassembled.
Inspect all parts for wear or damage.
Renew ball nut assembly if worm shaft
does not turn smoothly. Clamp ball nut
in a vise and measure end play of shaft
using a micrometer. Renew ball nut as-
sembly if end play exceeds 0,10 mm
(0.004
inch).
Worm shaft bearing journal
diameter wear limit is 24.90 mm (0.980
inch).
Inspect bearing and seal journal sur-
faces of sector shaft (26) for wear.
Renew shaft if journal diameter
(A-Fig. 39) is less than 31.90 mm (1.256
inches) or if diameter (B) is less than
27.90 mm (1,098 inches).
Check steering gear housing (23-Fig.
38) cylinder bore for wear or score
marks. Renew parts as necessary if
clearance between ball nut and housing
bore exceeds 0.15 mm (0.006 inch).
Inspect valve spool (7) and valve body
(19) for wear or scratches. Renew valve
assembly if clearance between spool and
valve body bore exceeds 0.025 mm
(0.001 inch).
To reassemble steering gear, reverse
the disassembly procedure while noting
the following special instructions. When
renewing sector shaft seals, install inner
seal (24) with open side facing inward
and install outer seal (22) with open side
facing outward. Install new worm shaft
oil seal (48) in end cover (46) with lip fac-
ing inward. Teflon seal rings can be
softened by soaking in hot water to aid
installation. Be sure that end of control
valve spool with the short inside
diameter chamfer is on side of valve
body marked with a
"P"
as shown in Fig.
36.
Assemble ball nut and shaft, thrust
bearings and control valve assembly to
gear housing. Install special assembly
plate (Fig, 35) using three cap screws
from cover plate to hold components in
place, then adjust bearing preload as
follows: While holding worm shaft, turn
adjusting nut (2-Fig. 38) until all end
play is removed. Stake the nut to the
shaft to prevent loosening. Remove
assembly plate and install cover plate
(1).
Position ball nut at center of worm
shaft, then install sector shaft, centering
the sector gear with the ball nut. Install
side cover (31), Install pitman arm on
sector shaft aligning reference marks
(Fig, 34) made prior to disassembly. If
Fig.
40—
Connect a pressure
gage (1) into power steering
supply line
(2)
using a tee
fit-
ting
(3)
to check power steer-
Ing reilef valve pressure set-
ting. Priority fiow control
valve (4) Is located on right
side of hydraulic lift housing
on 1700 and 1900 models
and Is not used on 2110
models.
no reference marks are present, install
arm so it points straight forward with
steering centered between full left and
full right positions.
After steering gear is reinstalled, ad-
just sector shaft adjusting screw
(27-Fig. 38) to provide recommended
steering wheel free travel of 20-30 mm
(%-lV8 inches). Check relief valve pres-
sure setting as outlined in paragraph 28,
All Models So Equipped
23.
RELIEF VALVE PRESSURE.
To check and adjust power steering re-
lief valve pressure setting, install a
0-20000 kPa (0-3000 psi) pressure gage
in power steering supply line using a "T"
fitting. Refer to Fig. 40 or 40A. Start
engine and operate steering to warm the
oil.
Set engine speed at 1900 rpm, turn
steering wheel to full left or right posi-
tion and observe pressure gage reading.
On all models except 2110, relief valve
pressure should be 6900 kPa (1000 psi)
on two wheel drive tractors and 10340
kPa (1500 psi) on four wheel drive trac-
tors.
On 2110 models, relief valve
pressure should be 10340 kPa (1500 psi)
on two wheel drive tractors and 13100
kPa (1900 psi) on four wheel drive trao
tors.
To adjust pressure setting, loosen
locknut (1-Fig. 41 or 42) and turn ad-
Flg. 40A
— A
separate pump
(4)
Is used for power steering
on 2110 modeis. Use a tee
fitting (3) to connect a gage
(1) In pressure line (2) to
check steering relief valve
pressure setting.
Fig. 39-Wear limit for steering sector shaft
bearing iournais is
31.90
mm
(1.^56 Inches)
at
(A)
and 27.90 mm
(1.096
Inches) at
(B).
23
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