International Harvester 3688

1981 - 1985

30 Series

Row-Crop tractor

Manufacturer

International Harvester

Row-Crop tractor

Built in Rock Island, Illinois, USA

Total built

2,572

Original price was $45,000 in 1981

3688 Hi-Clear

high-clearance model

International Harvester 7.1L 6-cyl diesel

16-speed partial power shift

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

Two- or four-wheel drive

Final drives

bull gear

Differential lock

rear

Power steering

Hydraulic wet disc brakes

Cab standard with heat and air-conditioning. Optional burgundy or western finish interiors.

Fuel

50 gal 189.2 L

Hydraulic system

22.5 gal 85.2 L

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

Rear Type

II

Control

draft sensing

Rear PTO

independent

Rear PTO Type

540/1000 (1.375)

Engine RPM

540@2100

1000@2100

Wheelbase

105 inches 266 cm

Weight

11300 to 13200 pounds

Front tire

11L-15

Rear tire

18.4-34

Ground

negative

Battery volts

12

Buyer's Guide 1982 published by International Harvester

International 30 Series Tractors published by International Harvester

Operator's Manual 3088, 3288, 3488-Hydro and 3688 Tractors (1258513C1) published in 1981

Tractors 90 & 110 HP published in 1981, by International Harvester

3288 and 3688 Product Guide published in 1981, by International Harvester

Manufacturer

International Harvester D436

Fuel Type

Diesel

Configuration

6-cylinder, liquid-cooled

Displacement

436 ci 7.1 L

Bore/Stroke

4.30x5.00 inches 109 x 127 mm

Air cleaner

dual dry elmement

Compression

16:1

Rated RPM

2400

Idle RPM

900-2400

Starter volts

12

Coolant capacity

26 qts 24.6 L

Oil capacity

14 qts 13.2 L

Type

partial power shift

Gears

16 forward and 8 reverse

Clutch

355.6mm 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.

With 18.4-34R1 rear tires.

Ag front

11L-15

Ag rear

18.4-34

Wheelbase

105 inches 266 cm

Length

184 inches 467 cm

Width

102 inches*Width at minimum tread. 259 cm

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

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