Old Ford Tractor '39-'64
Misc Specifications and Data

By: John Smith of Old Ford Tractors

Old Ford Tractor '39 - '64 Misc Specifications and Data

Spec8NNAA600800700900
WheelBase70"73.875"75.2"75.2"85.3"85.3"
Overall Length
115"118.875"121.4"121.8"132"132.4"
Overall Width
64.75"64.75"64.75"64.75"71.7"71.7"
Front Tread Width
48"-76"48"-76"52"-76"

52"-76"

8.3"-16.3"8.3"-16.3"
Rear Tread Width
48"-76"48"-76"52"-76"52"-76"56"-84"56"-84"
Ground Clearance
21"21"21"21"27.2"27.9"
Approx Shipping Weight
2410#2550#2750#2850#3100#3184#
Engine Type
4 cyl. "L" head4 cyl. OHV4 cyl. OHV4 cyl. OHV4 cyl. OHV4 cyl. OHV
Bore
3.188"3.4375"3.4375"3.90"

3.44"3.90"
Stroke3.75"3.60"3.60"3.60"3.60"3.60"
Displacement119.7 ci.134 ci.134 ci.172 ci.134 ci172 ci.
Compression Ratio
6.50:16.60:16.60:16.75:16.60:16.75:1
Firing Order
1-2-4-31-2-4-31-2-4-31-2-4-31-2-4-31-2-4-3
Idle Speed
400 RPM450-475 RPM450-475 RPM450-475 RPM450-475 RPM450-475 RPM
Maximum RPM (no load)
2000 RPM2000 RPM2200 RPM2400 RPM

2200 RPM

2400 RPM

Sleeves
Cast Alloy IronCast Alloy IronCast IronCast IronCast IronCast Iron
Pistons
Aluminum AlloyAluminum AlloyAluminum AlloyAluminum AlloyAluminum AlloyAluminum Alloy
Cooling System Type
PressurePressurePressurePressurePressurePressure
Fan
Four or Six BladeFour or Six BladeThree Blade

Three Blade

Three Blade


Three Blade

Initial Timing @ 475 rpm
4º BTDC¹8º BTDC8º BTDC5º BTDC8º BTDC5º BTDC
Advance @ 2000 RPM
18º2²29º to 31º29º to 31º
26º to 28º
29º to 31º26º to 28º
Point Gap
.0153³.024 to .026.024 to .026.024 to .026.024 to .026.024 to .026
Spark Plug size
14MM14MM14MM14MM14MM14MM
Spark Plug Gap
.025 to .028.025 to .028.025 to .028.025 to .028.025 to .028.025 to .028
Generator Type
Two Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt woundTwo Brush, shunt wound
Generator Capacity
20 amps, 140w20 amps, 160w20 amps, 140w20 amps, 140w20 amps, 140w20 amps, 140w
Battery6 volt positive ground6 volt positive ground6 volt positive ground6 volt positive ground6 volt positive ground6 volt positive ground

- 9N, 2N, 8N prior to serial number 263844..... 0º TDC
2 - 9N, 2N, 8N prior to serial number 263844..... 25º BTDC.  
3 - 8N side distributor after serial number 263843......025".

Capacities

Model or Series9N2N8NNAA600700800900501601701801901
Fuel Capacity10 gallons

10 gallons

10 gallons

11 gallons

11 gallons

11 gallons

14 gallons

14 gallons

13 gallons

13 gallons

17 gallons

17 gallons

Cooling System
12 quarts

12 quarts

12 quarts

15 quarts

15 quarts

15 quarts

15 quarts

15 quarts

15 quarts

15 quarts

15 quarts

15 quarts

15 quarts

Crankcase Capacity6 quarts

6 quarts

6 quarts

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

5 quarts (with filter change)

Transmission Capacity- 4 speed5 Gallons¹5 Gallons¹5 Gallons¹5 q5 q6.5 q5 q6.5 q6.5 q6.5 q6.5 q6.5 q6.5 q
Transmission Capacity- 5 speed8 q8 q8 q8.5 q

8.5 q

8.5 q

8.5 q

8.5 q

8.5 q

Differential CapacitySee note 1See note 1See note 18.5 q8.5 q8 q11.5 q8 q8 q8 q8 q11.5 q

8 q

Hydraulic System Capacity
See note 1

See note 1

See note 1

8 q

9 q

8 q

9 q

8 q

8 q

8 q

8 q

8 q

8 q

Steering Assembly CapacityN/AN/A1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.1 pt.
Air Filter Oil Cup Capacityapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pintsapproximately 1.3 pints
Oil Pump GPM
approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

approximately 3.4 GPM @ 1400 RPM

Water Pump GPMapproximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

approximately 16 GPM @ 1400 RPM

Thermostatopen @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

open @ 160º- open @ 180º

Pressure Caprelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psirelief valve opens @ .5 to 1.0 psi - pressure valve opens @ 3.5 to 4.5 psi

Note 1 -  9N2N, and 8N has a common sump for the hydraulic oil which also provides lubrication to the transmission and differential.   


NAA and Hundred series tractors have separate reservoirs for transmission lubricant, hydraulic fluid, and differential lubricant.

Clearances

Model or Series9N2N8NNAA600700800900501601701801901
2.248" - 2.249"2.248" - 2.249"2.248" - 2.249"2.248" - 2.249"2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

2.4974" - 2.4988"

Crankshaft End Play
.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006.002 - .006
Crankpin Diameter
2.094"2.094"2.094"2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

2.2978" - 2.2988"

Main Bearing Clearance
.001 - .003.001 - .003.001 - .003.0007 - .0023

.0007 - .0023

.0007 - .0023

.0007 - .0023

.0007 - .0023

.0007 - .0023

.0007 - .0023

.0007 - .0023

.0007 - .0023

.0007 - .0023

Connecting Rod Bearing Clearance
.001 - .0035

.001 - .0035

.001 - .0035

.002 - .0004

.002 - .0004

.002 - .0004

.002 - .0004

.002 - .0004

.002 - .0004

.002 - .0004

.002 - .0004

.002 - .0004

.002 - .0004

Connecting Rod Side Clearance.003 - .009

.003 - .009

.003 - .009

.003 - .009

.003 - .009

.003 - .009

.003 - .009

.003 - .009

.003 - .009

.003 - .009

Piston Pin Diameter
.7501 - .7504

.7501 - .7504

.7501 - .7504

.9121 - .9123

.9121 - .9123

.9121 - .9123

.9121 - .9123

.9121 - .9123

.9121 - .9123

.9121 - .9123

.9121 - .9123

.9121 - .9123

.9121 - .9123

Piston Pin Length2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

2.837" - 2.092"

Pin Clearance in Rod and Piston.0001 - .0003

.0001 - .0003

.0001 - .0003

.0001 - .0003

.0001 - .0003

.0001 - .0003

.0001 - .0003

.0001 - .0003

.0001 - .0003

.0001 - .0003

Connecting Rod Bushing I.D..9122 - .9125

.9122 - .9125

.9122 - .9125

.9122 - .9125

.9122 - .9125

.9122 - .9125

.9122 - .9125

.9122 - .9125

.9122 - .9125

.9122 - .9125

Fitting New Piston in New Bore
.0015.0015.0015.0015.0015.0015.0015.0015.0015.0015.0015.0015.0015
Fitting Used Piston in New Bore

.002

.002

.002

.002

.002

.002

.002

.002

.002

.002

.002

.002

.002

Fitting Used Piston in Used Bore.003

.003

.003

.003

.003

.003

.003

.003

.003

.003

.003

.003

.003

Piston Ring Side Clearance- top ring.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035.002 - .0035
Piston Ring Side Clearance- second ring.0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid).0015 - .003 (134cid) .002 - .0035 (172 cid)
Piston Ring Side Clearance- oil ring.0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid).0015 - .003 (134 cid) .002 - .0035 (172 cid)
Camshaft Bearing Clearance
.001 - .002.001 - .002.001 - .002.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

.0015 - 0.0035

Camshaft Journal Diameter
1.797"

1.797"

1.797"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

1.925" - 1.926"

Camshaft Gear Lash.002 - .006

.002 - .006

.002 - .006

.002 - .006

.002 - .006

.002 - .006

.002 - .006

.002 - .006

.002 - .006

.002 - .006

Camshaft End Play.003 - .007

.003 - .007

.003 - .007

.003 - .007

.003 - .007

.003 - .007

.003 - .007

.003 - .007

.003 - .007

.003 - .007

Camshaft Block Bore Diameter1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

1.9275" - 1.9285"

Rocker Arm Support Journal Diameter.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781.780 - .781
Rocker Arm Running Clearance.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

Valve Face Angle46º

46º

46º

46º

46º

46º

46º

46º

46º

46º

46º

Valve Seat Angle45º45º45º45º45º45º45º45º45º45º
Valve Seat Runout.002

.002

.002

.002

.002

.002

.002

.002

.002

.002

Valve Seat Width- intake.060 - .080

.060 - .080

.060 - .080

.060 - .080

.060 - .080

.060 - .080

.060 - .080

.060 - .080

.060 - .080

.060 - .080

Valve Seat Width- exhaust.090 - .110

.090 - .110

.090 - .110

.090 - .110

.090 - .110

.090 - .110

.090 - .110

.090 - .110

.090 - .110

.090 - .110

Valve Lash.014 - .016

.014 - .016

.014 - .016

.014 - .016

.014 - .016

.014 - .016

.014 - .016

.014 - .016

.014 - .016

.014 - .016

Valve Cap-to-Stem End Clearance.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

.002 - .004

Valve Guide Inside Diameter.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

.3436 - .3444

Valve Stem-to-Guide Clearance.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

Valve Stem Diameter- intake/red
.3418

.3418

.3418

.3418

.3418

.3418

.3418

.3418

.3418

.3418

.3418

.3418

.3418

Valve Stem Diameter- intake/green
.3423

.3423

.3423

.3423

.3423

.3423

.3423

.3423

.3423

.3423

.3423

.3423

.3423

Valve Stem Diameter- exhaust/red
.3408

.3408

.3408

.3408

.3408

.3408

.3408

.3408

.3408

.3408

.3408

.3408

.3408

Valve Stem Diameter- exhaust/green
.3413.3413.3413.3413.3413.3413.3413.3413.3413.3413.3413.3413.3413
Valve Timing- Intake Opens @15º before T.D.C

15º before T.D.C

15º before T.D.C

15º before T.D.C

15º before T.D.C

15º before T.D.C

15º before T.D.C

15º before T.D.C

15º before T.D.C

15º before T.D.C

Valve Timing- Intake Closes @35º after B.D.C

35º after B.D.C

35º after B.D.C

35º after B.D.C

35º after B.D.C

35º after B.D.C

35º after B.D.C

35º after B.D.C

35º after B.D.C

35º after B.D.C

Valve Timing- Exhaust Opens @41º before B.D.C

41º before B.D.C

41º before B.D.C

41º before B.D.C

41º before B.D.C

41º before B.D.C

41º before B.D.C

41º before B.D.C

41º before B.D.C

41º before B.D.C

Valve Timing- Exhaust Closes @15º after T.D.C

15º after T.D.C

15º after T.D.C

15º after T.D.C

15º after T.D.C

15º after T.D.C

15º after T.D.C

15º after T.D.C

15º after T.D.C

15º after T.D.C

Valve Lift- Intake.3553

.3553

.3553

.3553

.3553

.3553

.3553

.3553

.3553

.3553

Valve Lift- Exhaust.3370

.3370

.3370

.3370

.3370

.3370

.3370

.3370

.3370

.3370

.3370

Valve Rotators- exhaust
Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Free spin

Valve Tappet Diameter.4989 - .4995

.4989 - .4995

.4989 - .4995

.4989 - .4995

.4989 - .4995

.4989 - .4995

.4989 - .4995

.4989 - .4995

.4989 - .4995

.4989 - .4995

Valve Tappet Bore Clearance.0005 - .0021

.0005 - .0021

.0005 - .0021

.0005 - .0021

.0005 - .0021

.0005 - .0021

.0005 - .0021

.0005 - .0021

.0005 - .0021

.0005 - .0021

Oil Pump Drive Shaft-to-Body Clearance.0015 - .0029

.0015 - .0029

.0015 - .0029

.0015 - .0029

.0015 - .0029

.0015 - .0029

.0015 - .0029

.0015 - .0029

.0015 - .0029

.0015 - .0029

Oil Pump Driven Gear-to-Pin Clearance.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

.001 - .002

Oil Pump Gear-to-Pump Body Side Clear..005 max.

.005 max.

.005 max.

.005 max.

.005 max.

.005 max.

.005 max.

.005 max.

.005 max.

.005 max.

Original Wheels and Tires

Model or SeriesFront TireRear Tire
9N4x1910x28
2N4x1910x28
8N¹4.00x1910x28
NAA²4.00x1910x28
600 Series5.50x1611x28
601 All Purpose Model

5.50x16

11x28
601 Special Utility Model

5.50x16

10x28

621 Special Utility Model

5.50x16

10x28

631 Special Utility Model

5.50x16

10x28

641 Special Utility Model

5.50x16

10x28

651 Special Utility Model

5.50x16

10x28
661 Special Utility Model

5.50x16

10x28
700 Series

5.50x1611x28
7015.50x16

11x28

7415.50x16

11x28
771

5.50x1611x28

800 Series

6.00x1612x28
801 All Purpose Model

6.00x1612x28
801 Special Utility Model

5.50x1610x28

811 Special Utility Model

5.50x1610x28
821 Special Utility Model

5.50x1610x28
900 Series

5.50x1611x28

901 Series

5.50x1612x28

1- 5.50x16 front tires optional
2- 5.50x16 front and 11x28 rear optional.

Tire Inflation Chart

Tire Size/PositionInflation PressureMax Lbs. Load Per Wheel
10.00x28 4-ply rear

16 psi1860

10.00x38 4-ply rear

16 psi

2155

11.00x28 4-ply rear

14 psi

2070
12.00x28 4-ply rear

14 psi

2430
12.00x38 4-ply rear

14 psi

2420

12.40x28 4-ply rear

14 psi

2070

13.00x24 4-ply rear

14 psi

2470

13.60x28 4-ply rear

14 psi

2430
14.00x24 4-ply rear

16 psi

3560
14.90x24 4-ply rear

18 psi

3125
14.90x28 4-ply rear

14 psi

2630
5.50x16 4-ply front

28 psi

1060

6.00x16 4-ply front

20 psi

755

6.50x16 6-ply front

28 psi

1050

7.50x16 8-ply front

44 psi

2390

9.00x16 8-ply front

49 psi

1620

Liquid Weight Chart

Tire SizeGals of WaterLbs. of Calcium ChlorideTotal Weight Added
9:00 x 10 front
945

120

5:50 x 16 front
4.5

22.560
6:00 x 16 front
5.2

2669
6:50 x 16 front
5.9

29.579
7:50 x 16 front
9

45120
10:00 x 28 rear
24122

324
10:00 x 38 rear
31157416
11:00 x 28 rear
32160426

12:00 x 28 rear
39197525
12:00 x 38 rear
51

257685
13:00 x 24 rear
44219

584
13:00 x 28 rear
49246648

13:60 x 28 rear
39

197525
14.90 x 24 rear
44219584
14:90 x 28 rear
49246

648

Torque Specifications '53 - '64

Engine

HeaderHeader 2
Camshaft Thrust Plate to Cylinder Block10-16 ft.lbs.

Camshaft Gear to Camshaft
45-50 ft.lbs.

Carb Throttle Body to Fuel Bowl
36 in.lbs.



Connecting Rod Nuts45-50 ft.lbs.


Connecting Rod Pal Nuts
3-4 ft.lbs.

Crankshaft Pulley to Crankshaft
100-110 ft.lbs.

Cylinder Front Cover
15-18 ft.lbs.

Cylinder Head Bolts
65-70 ft.lbs.

Flywheel to Crankshaft
75-85 ft.lbs.

Hydraulic Pump Gear Cover to Cylinder Block
18-21 ft.lbs.

Main Bearing Cap Bolts
95-105 ft.lbs.

Manifolds to Cylinder Block
40-50 ft.lbs.

Governor Cylinder Front Cover
15-18 ft.lbs.

HeaderHeader 2
Oil Pan to Cylinder Block
15-18 ft.lbs.

Oil Filter to Cylinder Block
20-25 ft.lbs.

Oil Pump to Cylinder Block
30-35 ft.lbs.

Oil Tubes to Oil Pump Cover Plate
10-15 ft.lbs.

Rocker Arm Shaft Bolts
45-50 ft.lbs.

Spark Plugs
24-30 ft.lbs.

Valve Push Rod Chamber Cover
20-30 in.lbs.

Valve Rocker Arm Cover
8-10 ft.lbs.

Valve Rocker Arm Support to Cylinder Head
45-50 ft.lbs.

Water Outlet Elbow
8-10 ft.lbs.

Water Pump to Cylinder Block
15-18 ft.lbs.

Throttle Body to Fuel Bowl

36 in.lbs.

Governor Case to Front Cover
6-10 ft.lbs.

Transmission

Header 1Header 2
Engine Adapter Plate Nuts
25-30 ft.lbs.

Distributor Attaching Bolts
20-30 ft.lbs.

Interlock Cover Attaching Bolts
35-40 ft.lbs.

Lever Pin Retaining Bolt
90-110 ft.lbs.

P.T.O. Bearing Retainer Nuts
12-15 ft.lbs.

P.T.O. Hydraulic Fluid Line Fitting to Distributor
10-12 ft.lbs.

Pump Mounting Bolts
15-18 ft.lbs.

Header 1Header 2
Rear Support Mounting Bolts
35-40 ft.lbs.

Servo #1 Cover Attaching Bolt
20-25 ft.lbs.

Servo Actuating Lever Pin Nuts
100-120 ft.lbs.

Torque Limiting Clutch Mounting Bolts
25-30 ft.lbs.

Transmission Cover Attaching Bolts
18-23 ft.lbs.

Valve Body Mounting Bolts
5-8 ft.lbs.

Front Axle

Header 1Header 2
Axle Half to Center Axle Nut
135-150 ft.lbs.

Center Axle Pin
200 ft.lbs.

Radius Rod to Center Axle Nut
75-135 ft.lbs.

Radius Rod to Transmission Housing Nut
45-50 ft.lbs.

Spindle Arm to Spindle Nut
60-70 ft.lbs.

Support to Engine Nut
135-150 ft.lbs.

Rear Axle

Header 1Header 2
Axle Shaft Retainer or Final Drive Nuts
130-150 ft.lbs.

Axle to Center Housing Nuts
55-65 ft.lbs.

Axle to Center Housing Studs
40-45 ft.lbs.

Center Housing to Transmission Housing
40-50 ft.lbs.

Differential Case
90-100 ft.lbs.

Drive Gear Bolts
90-110 ft.lbs.

Thrust Block Bolts
25-30 ft.lbs.

Header 1Header 2
Lower Link Shaft Nut (inside)
150 ft.lbs.

P.T.O. Shifter Plate
40-55 ft.lbs.

Pinion Retainer Bolts
80-100 ft.lbs.

Relief Valve Plate Bolts
35-45 ft.lbs.

Wheel Lug Nuts
80 ft.lbs.

Axle Nut
450 ft.lbs.

Power Take-Off

Heading 1Heading 2
Belt Pulley Assembly to Center Housing Bolts35-40 ft.lbs.

Conversion to Center Housing Bolts
40-50 ft.lbs.

P.T.O. Conversion Cover Bolts
40-50 ft.lbs.

Heading 1Heading 2
P.T.O. Cover Bolts
35-40 ft.lbs.


Shift Cover Nuts
45 ft.lbs.


Shift Lever Studs
40-45 ft.lbs.


Steering

Heading 1Heading 2
Adapter to Steering Gear Housing
20-25 ft.lbs.


Sector Shaft Cover Bolts
25-30 ft.lbs.



Heading 1Heading 2
Steering Gear Housing to Transmission Housing
60-70 ft.lbs.


Steering Shaft Cover Retaining Screws
25-30 ft.lbs.



Old Ford Tractor PTO Horsepower Ratings

ModelPTO Speed at Engine RPMHorsepower
9N

727 @ 2000

23.6

8N ('47-'48)

727 @ 2000

23.6

8N ('49-'52)
727 @ 2000

26.2

Jubilee/NAA
727 @ 2000

31.1

640- Gas
727 @ 2000

31.0

640- LP
727 @ 2000

28.4
660- Gas
685 @ 2000

34.2

740- Gas
727 @ 2000

31.6
850- LP
685 @ 2000

39.5
860- Gas
685 @ 2000

45.4

960- Gas
685 @ 2000

46.3

621, 631, 641, 741- Gas
727 @ 2000

33.6
651, 661- Gas
685 @ 2000

35.8

821, 841, 941- Gas
727 @ 2000

44.7

851, 861, 951, 961- Gas
685 @ 2000

48.4

541D, 641D, 741D- Diesel
727 @ 2000

31.8

821D, 841D, 941D- Diesel
727 @ 2000

39.9

851D, 861D, 951D, 961D- Diesel
685 @ 2000

42.0

841L- LP
727 @ 2000

42.0
Select-O-Speed 671, 681, 771- Gas
693 @ 2000

34.3

Select-O-Speed 671, 681, 771- Diesel
693 @ 2000

31.6

Select-O-Speed 671, 681, 771- LP
693 @ 2000

32.6

Select-O-Speed 871, 971- Gas
693 @ 2000

46.2
Select-O-Speed 871, 881, 971, 981-Diesel
693 @ 2000

41.4

Select-O-Speed 871, 881, 971, 981- LP
693 @ 2000

43.6

Thanks to John Smith of Old Ford Tractor for allowing us to use this information.