International Harvester 3688 tractor specifications

1981 - 1985

1981 - 1985 30 SeriesRow-Crop tractor

Production

Production Manufacturer:International Harvester
Type:Row-Crop tractor
Factory:Rock Island, Illinois, USA
Total built:2,572
Original price:$45,000 (1981 )

Variants

Variants 3688 Hi-Clear:high-clearance model

International Harvester 3688 Power

International Harvester 3688 Power Drawbar (claimed):100.2 hp
74.7 kW
PTO (claimed):113 hp
84.3 kW
Drawbar (tested):99.21 hp
74.0 kW
PTO (tested):113.72 hp
84.8 kW
power test details ...

1981 - 1985

30 Series

Row-Crop tractor

Nebraska Tractor Test 1440

Nebraska Tractor Test 1440
Diesel 16-speed 2WD May 26, 1982 - June 7, 1962 Link: Nebraska Tractor Test 1440 file
PTO performance
Power at rated engine speed:	113.72 hp 84.8 kW
Fuel use:	7.5 gal/hour 28.4 l/hour
Power at rated PTO speed:	112.48 hp 83.9 kW
Fuel use:	7.1 gal/hour 26.9 l/hour
Drawbar performance
Max power:	99.21 hp 74.0 kW
Fuel use:	7.5 gal/hour 28.4 l/hour
Max pull:	12250 lbs 5556 kg

International Harvester 3688 Engine

International Harvester 3688 Engine International Harvester 7.1L 6-cyl diesel Engine details ...

1981 - 1985

30 Series

Row-Crop tractor

Engine Detail

Engine Detail
International Harvester D436
diesel
6-cylinder
liquid-cooled
Displacement:	436 ci 7.1 L
Bore/Stroke:	4.30x5.00 inches 109 x 127 mm
Air cleaner:	dual dry elmeent
Compression:	16:1
Rated RPM:	2400
Idle RPM:	900-2400
Starter volts:	12
Coolant capacity:	26 qts 24.6 L

Engine Oil

Engine Oil

Oil capacity:	14 qts 13.2 L

Mechanical

Mechanical Chassis:4x2 2WD
4x4 MFWD 4WD
Steering:power
Brakes:hydraulic wet disc
Cab:Cab standard with heat and A/C. Optional burgundy or western finish interiors.
Transmission:16-speed partial power shift
Transmission details ...

1981 - 1985

30 Series

Row-Crop tractor

Transmission

Transmission
Type:	partial power shift
Gears:	16 forward and 8 reverse
Clutch:	cerametallic disc
Oil capacity:	90 qts 85.2 L
Left lever selects gear, right lever selects high, low, or reverse range. Tractor may be shifted on the move without the clutch between gear pairs (1-2, 3-4, etc). Synchronized shifting, using the clutch, between gear pairs (2 to 3, 4 to 5, etc). The transmission is four-gear with the powershift provided by an electric solenoid actuated Torque Amplifier.

Speeds

Speeds
With 18.4-34R1 rear tires.

Capacity

Capacity Fuel:50 gal
189.3 L
Hydraulic system:22.5 gal
85.2 L

Hydraulics

Hydraulics Type:closed center
Capacity:22.5 gal
85.2 L
Valves:2 to 4
Pump flow:18 gpm
68.1 lpm
Total flow:27 gpm
102.2 lpm
Steering flow:12 gpm
45.4 lpm

Tractor hitch

Tractor hitch Rear Type:II
Control:draft sensing

Power Take-off (PTO)

Power Take-off (PTO) Rear PTO:independent
Rear RPM:540/1000
Engine RPM:540@2100
1000@2100

Dimensions & Tires

Dimensions & Tires Wheelbase:105 inches
266 cm
Weight:11300 to 13200 pounds
Front tire:11L-15
Rear tire:18.4-34
Full dimensions and tires ...

1981 - 1985

30 Series

Row-Crop tractor

International Harvester 3688 Tires

International Harvester 3688 Tires
Ag front:	11L-15
Ag rear:	18.4-34

Dimensions

Dimensions
Wheelbase:	105 inches 266 cm
Length:	184 inches 467 cm
Width:	102 inches 259 cm *Width at minimum tread.
Height (cab):	112 inches 284 cm
Shipping weight:	11300 lbs 5125 kg
Operating weight:	13200 lbs 5987 kg
Ground clearance:	13 inches 33 cm
Rear axle:	3.25 by 104 inches 82 by 2641 mm
Rear axle:	3.25 by 118 inches 82 by 2997 mm
Front tread:	60 to 84 inches 152 to 213 cm
Rear tread:	66 to 128.5 inches 167 to 326 cm

3688 Serial Numbers

3688 Serial Numbers Location:Serial number plate on the right side of the tractor frame, ahead of the rear axle.
1981:501
1982:1743
1983:2482
1984:2695
1985:3068

how to read serial numbers...