BRAKES 5-59
F ig . 101—A i r Brake C o n tro l V a lv e
2. R eta in er
3. D iaphragm
4. Ring
5. Exhaust V a lv e Body
7. S pring
8. Seal
9. V a lv e
10. V a lv e Body
11. In stall plunger (17) into mounting bracket (16).
12. In stall boot (18) on plunger (17).
CONTROL VALVE (Fig. 1 02 )
(Tilt C ab)
Theory of O peration
As the d r iv e r d ep resses the pedal, p ressu re is exerted
against the plunger which m oves the piston up to close
the exhaust v a lv e and open the inlet v a lv e p erm ittin g a ir
p re s s u re at the inlet p ort to flo w past the in let va lve
and out the d e liv e r y p ort to the brake cham bers to apply
the brakes.
R e s e r v o ir a ir p ressu re a lso passes through to a sm all
o r ific e to cavity (A ). When this p ressu re is equal to the
m echanical fo r c e applied by the pedal, the piston m oves
down to close the in let v a lv e cutting off fu rth er supply of
a ir p re s s u re to the brakes. The exhaust v a lv e rem ains
clo sed preven tin g any lo ss of a ir p ressu re. In this po
sition the brake va lv e is in the lap position and instantly
resp on sive to any m ovem ent of the pedal to in crea se o r
d ecrea se a ir p re s s u re being d e liv e re d to the brake
cham bers.
When the d r iv e r returns the pedal to its fu ll re le a s e
position, the piston com pletes its downward m ovem ent
to unseat the exhaust v a lv e and a ll p ressu re in the s e r v
ic e line, not exhausted through a quick r e le a s e valve,
is re le a s e d through the cen ter of the piston and the brake
v a lv e exhaust port.
PEDAL ADJUSTMENT
The pedal is adjusted by means of a pedal stop screw .
The pedal stop s c re w adjustment controls the exhaust
opening between the hollow end of the application va lv e
piston and the exhaust v a lv e . It also con trols the pedal
t r a v e l b e fo re brake application begins. If the stop s crew
is turned down too fa r , it w ill p reven t the piston fro m
lea vin g the exhaust va lv e and the brakes w ill not r e le a s e
o r resu lt in slow brake re le a s e . If the stop s c re w is not
turned down fa r enough, e x c e s s iv e pedal tra v e l w ill be
req u ired to sta rt the brake application, and fu ll applica
tion m ay not be obtained. Adjust the stop s c re w as
fo llo w s:
11. S pring
12. Seal
13. Seal
14. Piston A ssem bly
15. Snap Ring
16. M o u n tin g B racke t
17. P lunger
18. Boot
19. B olt
20. Lock W asher
1. Loosen lock nut on pedal stop screw .
2. Back stop s c re w out until there is fr e e play between
the push rod and the application va lv e piston cup.
3. Turn stop s crew down until a ll fr e e play is r e
moved; then back s c re w out 1/2 turn.
AIR G A U G E
TRACTOR PROTECTION VALVE
LINE P R O V IS IO N
PR O V IS IO N OR PLUGGED (RPO J-75)
INLET PORT
PLUG OR
T O EMERGENCY
CO NTRO L VALVE
(RPO J-75)
1 3-EXHAUST VALVE
DELIVERY PORT
F ig . 102—C o n tro l V a lv e ( T ilt C ab)
1. Body
11. ‘ O ’ Ring
2. Snap Ring
12. Piston
3. S pring G u id e
13. Exhaust V a lv e
4.
Exhaust Port Hose F ittin g
14. ‘ O ’ Ring
5. Rubber C ushion and
15. V a lv e S pring
Shim Washers
16. End Cap
6. S pring
17.
In le t V a lv e
7. Snap Ring
18. N u t
8. V e e Seal
19. G a ske t
9. Shim W asher
20. Stop Screw
10. S pring
21. C age
CHEVROLET TRUCK SERVICE MANUAL
Содержание 10 Series 1970
Страница 1: ......
Страница 38: ...HEATER AND AIR CONDITIONING 1A 8 CHEVROLET TRUCK SERVICE MANUAL...
Страница 57: ...HEATER AND AIR CONDITIONING 1A 27 Fig 35 Compressor M ountings CHEVROLET TRUCK SERVICE MANUAL...
Страница 75: ...HEATER AND AIR CONDITIONING 1A 45 Fig 65 R oof M ounted System W iring Diagram CHEVROLET TRUCK SERVICE MANUAL...
Страница 78: ......
Страница 101: ...BODY IB 23 s A ADJUSTER SCREW AND LEVER ASSY Fig 5 9 Exploded V iew o f Level Ride Seat CHEVROLET TRUCK SERVICE MANUAL...
Страница 137: ...BODY IB 59 VIEW IN DIRECTION OF ARROW A Fig 137 A u x ilia ry Seat CHEVROLET TRUCK SERVICE MANUAL...
Страница 142: ...CHEVROLET TRUCK SERVICE MANUAL Fig 5 10 30 Series Truck Frame FRAME 2 4...
Страница 145: ...CHEVROLET TRUCK SERVICE MANUAL FRAME 2 7...
Страница 148: ......
Страница 228: ...REAR SUSPENSION AND DRIVE LINE 4 52 I Fig 88 Forward Rear A xle Assembly Exploded V iew CHEVROLET TRUCK SERVICE MANUAL...
Страница 238: ......
Страница 383: ...ENGINE FUEL 6M 19 F ig I t Engine Fuel S p ecial Tools CHEVROLET TRUCK SERVICE MANUAL...
Страница 384: ......
Страница 392: ......
Страница 432: ...Fig 1 C lu tch Linkage Except P 2 0 4 0 Series...
Страница 433: ...CLUTCHES AND TRANSMISSIONS 7 3 Fig 2 C lutch Linkage Step Van P 20 40 Series CHEVROLET TRUCK SERVICE MANUAL...
Страница 506: ...FUEL TANK AND EXHAUST SYSTEMS 8 8 Fig 10 Vent Lines Cab M ounted Tanks CHEVROLET TRUCK SERVICE MANUAL...
Страница 528: ...Fig 31 T yp ica l Power Steering Hose Routings...
Страница 530: ......
Страница 550: ......
Страница 566: ...ELECTRICAL BODY AND CHASSIS 12 4 Fig 3 Front Lighting Assemblies CHEVROLET TRUCK SERVICE MANUAL...
Страница 567: ...ELECTRICAL BODY AND CHASSIS 12 5 Fig 4 C learance and Id e n tific a tio n Lamps CHEVROLET TRUCK SERVICE MANUAL...
Страница 568: ...ELECTRICAL BODY AND CHASSIS 12 6 Fig 5 Rear Lighting Composite CHEVROLET TRUCK SERVICE MANUAL...
Страница 597: ...ELECTRICAL BODY AND CHASSIS 12 35 Fig 37 Engine Com partm ent CE M E60 CHEVROLET TRUCK SERVICE MANUAL...
Страница 598: ...ELECTRICAL BODY AND CHASSIS 12 36 TO FRAME i f Fig 38 Engine Com partm ent C D 50 CHEVROLET TRUCK SERVICE MANUAL...
Страница 608: ...ELECTRICAL BODY AND CHASSIS 12 46 Fig 48 Instrument Panel C A40 CE CS ME50 Exc 02 CHEVROLET TRUCK SERVICE MANUAL...
Страница 610: ...ELECTRICAL BODY AND CHASSIS 12 48 Fig 50 Instrument Panel CE M E60 03 13 CHEVROLET TRUCK SERVICE MANUAL...
Страница 614: ...ELECTRICAL BODY AND CHASSIS 12 52 Fig 54 Instrument Panel SA40 50 CHEVROLET TRUCK SERVICE MANUAL...
Страница 628: ......
Страница 640: ......
Страница 649: ...SPECIFICATIONS 9 ENGINE SECTION 6 CHEVROLET TRUCK SERVICE MANUAL...
Страница 671: ......