Chevrolet DB90 Series, Руководство по обслуживанию

Страница: 188 / 242

S ec. 9B -182
POWER STEERING
SYSTEMS!, AND/OR COULD RESULT IN MAJOR
REPAIR EXPENSE. THEY MUST BE REPLACED
WITH PARTS OF THE SAME PART NUMBERS OR
WITH EQUIVALENT PARTS IF REPLACEMENT
BECOME^ NECESSARY. DO NOT USE REPLACE­
MENT P^RTS OF LESSER QUALITY OR SUBSTI­
TUTE DEjSIGN. TORQUE VALUES MUST BE USED
AS SPECIFIED DURING REASSEMBLY TO ASSURE
PROPER DETENTION OF THESE PARTS.
POWER STEERING HOSES
th
When
tw isting
the w heels
the wheel,
movem ent
contact w:
cau se cha:
serv icin g power steerin g h o se s, avoid
e h oses u n n e cessa rily . Install h o ses with
in the straigh t-ah ead position, then turn
5
to the right and left, w hile observing
of the h o se s. Note and co rrect any hose
th other p arts of the veh icle that could
ing or w ear.
Any m aintenance operation, on the power
ste erin g equipment, should include a thorough in­
sp ection of the hydraulic lin e sy ste m , including the
o il co o ler if used ,
POWER STEERING GEAR
AND CONTROL VALVE
A ll inform ation in the 1970 Heavy Duty Truck
S ervice Manual ST 135-70 on page 9 -2 9 i s appli­
cable to m odels covered by th is supplem ent. The
follow ing inform ation a lso applies:
The 553-DV, 554-DV, and 568-D V type power
ste e r in g gear a sse m b lie s a re b a sica lly the sam e
except for s iz e and mounting. The 568-DV type
ste erin g gear (figs 1 and 2) incorporates a back­
up adjuster to prevent the worm shaft from flexing
and stop pins a re located at each end of the worm
thread to prevent the ball nut from bottom ing on
extrem e turns.
24 Lock W asher
, / , 6
Q
. /
■ V
f ( ~> ^
d
— p i o 21
& //m /
* m
11
W t &>
16 Worm Bearing A djuster Nut
17 Valve Lower O -ring Seal
18 Valve Cover
19 Valve C over to Adapter Attaching Bolt
20 Lock W asher
21 Valve Body
Pj 22 Valve Spool
23 Adapter to Gear Housing Attaching Bolt
Valve Body to Gear Housing Adapter
n r * '■ 1
t f k f l ’'/
Adapted N eedle Bearing 9 C entering Springs
Adapter O -rin g Seal 10 Connector O -ring S eals
Valve Upper O -ring Seal
11 C onnectors
§
Bearing Race - Sm all 12 Bearing Race - Large
*
Upper Bearing
13 Lower Bearing
20
Bearing Race - Large
14 Bearing Race - Sm all
Plungers
15 Valve Spool Preload Spring
TPM-7372
Figure 1 - 5 6 8 - D V Steering G ear H ydraulic V a lv e Com ponents
CHEVROLET SERIES 70-90 HEAVY DUTY TRUCK SHOP MANUAL SUPPLEMENT