Steering Control Valve - TM-10-3930-243-340212

( 4 ) Position the cap locator bushing (23) with

3-59. Steering Control Valve

l a r g e outside diameter chamfer up. Place mounting

a. General. The steering control valve is mounted

p l a t e (25) over spool shaft. Install bolts and torque

t o the lower steering column. The steering control

to 250 inch pounds.

v a l v e channels hydraulic pressure to provide power

( 5 ) Place plate (2) on metered end of housing

steering for the fork lift.

( 1 1 ) and place meter gear ring (3) on housing so

b. Removal. Refer to figure 3-122 and remove

that holes align.

t h e steering control valve.

(6) Place the splined end of the drive (1)

NOTE

within the meter gear star (3) so that the slot at the

Mark the two cap screw holes so that the port will be

control end of drive is in alignment with the valleys

in proper direction when reassembled.

b e t w e e n the meter gear teeth. Push the splined end

c. Disassembly. Refer to figure 3-123 and

of the drive through the gear so that the spline

disassemble steering control valve as follows:

e x t e n d s about one half its length beyond the meter

( 1 ) Clamp unit in vise across mounting plate

gear star and hold it in this position while installing

edge (25) with meter end up and remove 7 cap

into the unit. Note position or direction of cross pin

screws (9) and remove pump drive (1) and pump

(13) within unit. Enter meter gear star into the

assembly (2 thru 8).

meter gear ring and wiggle the parts slowly in

( 2 ) Place clean wood block across vise throat

position so that the drive (1) does not become

t o support spool parts and clamp unit across port

d i s e n g a g e d from the meter gear star (3). Hold the

face with control end up.

plate (2) and meter gear ring (3) in position on the

( 3 ) Remove screws and lift off end cap (25).

housing (11) while the star is being installed.

(4) R e m o v e c a p l o c a t o r b u s h i n g ( 2 3 ) .

Rotate meter gear star slightly to bring the cross

(5) Place housing (11) on solid surface with

slot of the drive (1) into engagement with cross pin

p o r t face down so that it can be held securely and

( 1 3 ) and splined end of the drive will drop against

remove spool-sleeve assembly (12 thru 16) from the

the plate.

1 4 hole end of housing.

CAUTION

(6) Place housing (11) in vise, control end up,

Alignment of the cross slot in the drive

and unscrew check valve seat (19) with 3/16 hex

with valley between the teeth of the

wrench.

meter gear star determines proper valve

( 7 ) Up end the housing (11) and tap slightly

t i m i n g of the unit. There are 12 teeth on

w i t h butt of hand and remove check ball (20) and

t h e spline and 6 pump teeth on the star.

spring (21).

A l i g n m e n t is exactly right in 6 positions

d. Inspection.

a n d exactly wrong in 6 positions. If the

(1) Inspect mating surfaces for obvious

parts slip out of position during this

leakage path, wear, and seal conditions.

part of reassembly, repeat step 6 above

( 2 ) Inspect all moving surfaces to insure that

u n t i l y o u are certain

that correct

they have not been scored or abraded by dirt

alignment is obtained.

particles or otherwise disrupted.

( 7 ) Place the spacer (4) in position within the

( 3 ) Insure that all edges of parts for metered

e n d of the meter gear star. If spacer does not drop

section are burr free. Use 600 grit abrasive paper to

f l u s h with gear surface, the drive has not properly

remove burrs and scratches.

engaged the cross pin. Recheck.

e. Reassembly. Refer to figure 3-123 and

(8) Place the meter end cap (8) over the

reassemble steering control valve in reverse order of

a s s e m b l y and install two capscrews, finger tight, to

disassembly as follows:

maintain alignment of parts.

(1) Install spring (21), ball (20) and check

(9) Install all seven cap screws and bring them

seat (19). Torque check seat to 150 inch-pound

gradually and evenly to 150 inch-pounds torque.

torque. Install seal plug (18) and O-ring (17).

f. Installation.

( 2 ) Reassemble spool-sleeve assembly (12 thru

(1) Check condition of the steering column

16).

assembly.

( 3 ) Install spool assembly so that the splined

(2) Refer to figure 3-122 and install the

e n d of spool enters the 14 hole end of the housing

steering control valve.

(11) first. Bring spool assembly entirely within

h o u s i n g bore until parts are flush at meter end or

NOTE

14 hold end of housing. Do not pull spool assembly

Rotate the steering shaft while bringing the surfaces

into contact to allow splines to engage.

beyond this point to prevent the cross pin from

dropping into discharge groove of housing, With

(3) Torque capscrews to 280 inch pounds.

spool assembly in this flush position, check for free

r o t a t i o n within housing by turning with light finger

force at the spliced end.

3-174