Chevrolet 70 1969 Series, Shop Manual

Page: 486 / 913

STEERING SYSTEM 9B-37
POWER STEERING SPECIFICATIONS
POWER STEERING HYDRAULIC PUMP MODEL APPLICATION
T R U C K SERIES G E A R M O D E L G E A R R A T IO
Series H/J-70 and 80 ......................... ..................................... ........... 553-DV-82 28.14 to 1
Series T-70 .................................................................................. ........... 553-DV-62 28.14 to 1
Series T-80 .................................................................................. ........... 553-DV-55 28.14 to 1
Series JM-8Q with F-160 Front A x l e ...................................... ........... 553-DV-77 28.14 to 1
STEERING GEAR ADJUSTMENTS
Thrust Bearing P r e l o a d ......................................... 1 to 3 inch-pounds in excess of valve assembly drag
Thrust Bearing Adjustment Plus Seal D r a g ......................................................... 8 inch-pounds maximum
Pitman Shaft P r e l o a d ................ 4 to 8 inch-pounds in excess of total bearing preload and valve drag
Final Over-Center Reading (total of valve and seal drag,
worm bearing preload, and lash adjuster preload)...................................... 16 inch-pounds maximum
POWER STEERING GEAR APPLICATION CHART
T R U C K SERIES P U M P M O D E L
H M /J M /T M - 8 0 ..................................................................................................................................... 235-P-48
HV/JV-70 ........................................................................................................................................... 235-P-36
JM-80 with F160 Front A x l e ............................................................................................................ 235-P-124
HYDRAULIC PUMP SPECIFICATIONS
V A N E - T Y P E P U M P
M a k e ............................................................................................................Saginaw Steering Gear Division
Minimum Capacity per Minute . . . . 2.35 G .P .M . of Type “ A ” automatic transmission fluid at 170°F.
when operating pump at idle speed against 665/735 P.S.I. pressure.
Maximum Capacity per Minute—
Except 235-P-124.............................3.5 G .P .M . of Type “ A ” automatic transmission fluid at 170°F.
when operating pump at 1500 R .P .M . against 50 P.S.I. pressure.
235-P-124................4.8 to 5.2 G .P .M . of Type " A ” automatic transmission fluid at 170°F.
when operating pump at 1500 R .P .M . against 50 P.S.I. pressure.
Pressure Relief Valve
Except 235-P-124
Minimum P.S.1................................................................................................................................ 900
Maximum P.S.1............................................................................................................................... 1000
Pump Models 235-P-124
Minimum P.S.1......................................................................................................................................1100
Maximum P.S.1..................................................................................................................................... 1200
S L IP P E R T Y P E P U M P
M a k e ......................................................................... ........................................................ Thompson Products
Capacity
Maximum ........................................................................................................................ 3.4 to 4.1 gpm
Minimum ................... 1.45 gpm when operating pump at idle speed against 665/735 psi pressure
Pressure Relief Valve
Minimum ( p s i ) ...............................................................................................................................1000
Maximum (p si)...............................................................................................................................1100
POWER STEERING POWER CYLINDER
Make ............................. Saginaw Steering Gear Division
T y p e .........................................................................Hydraulic
Length and S t r o k e ............................. See chart following
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SHO P M ANUAL