MIL-T-62735 Trucks And Truck Tractors: Modified Commercial, General Specification ForThis specification covers general requirements for the classes, models and types of modified commercial trucks indicated in the specification title above and in 1.2 below. This specification is intended only as a document to be referenced in detail specification sheets that must, as a minimum, cover detailed truck body requirements and specify the model and class required from table I.

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MIL-T-62735

Table VII. Vehicle forward speeds and transmission PTO openings. (continued).

Model	Class	Minimum number of vehicle		PTO openings
		forward speeds
		Dump truck and truck tractor	Truck
4x4 6x6 6x4 6x4 6x4 8x4 8x6	All All 32 to 34 34.5 to 44 44.5 and over All All	9 transmission speeds, 9 to 18 vehicle speeds 9 transmission speeds, 9 to 18 vehicle speeds 9 9 13 13 9 transmission speeds, 18 vehicle speeds	9 9 8 9 13 13 9 transmission speeds, 18 vehicle speeds	1 1 2 2 2 2 1

3.3.11.2 Power takeoff (PTO) openings. Unless otherwise specified, the manual transmission shall have the number of PTO openings specified in table VII, all conforming to SAE J704. When specified (see 6.2), or when required to power PTO driven equipment, the PTO opening shall be of the heavy duty type. The clearance envelope for all transmission PTO openings shall conform to SAE J772.

3.3.11.3 Clutch. The clutch shall be the largest capacity clutch offered for the type, model and class of vehicle and engine. Clutch torque capacity shall exceed the maximum delivered engine torque. The clutch lining shall be asbestos free. The clutch on model 6x4, 6x6,

8x4 and 8x6 shall have spring dampening and a greaseable bearing.

3.3.11.4 Transfer case. Model 4x4, 6x6 and 8x6 shall have a transfer case. Unless otherwise specified or required by table VII, the transfer case may have one or two speeds. Unless the transfer case is equipped with devices which compensate for differential torque and speeds between the front and rear axles, the transfer case shall provide for the driver to select either rear wheel drive or front and rear wheel drive (except no drive is required for the pusher

axle on 8x4 and 8x6 models). When furnished, inter-axle compensating devices shall provide for

positive transfer of power to all driving axles.

3.3.11.4.1 Two speed transfer case. When specified (see 6.2) or when required in accordance with table VII, the transfer case shall have two forward speeds. The speedometer shall read accurate speed (km/h and mph) with the speed selector on two-speed transfer cases in both high and low range.