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MIL-DTL-62460 Steer Unit, Tracked Vehicle, Clutch Brake And Geared SteerThe steer unit covered by this specification is intended for use as a steer unit for the Armored Combat Earthmover M9 ACE. The steer unit is a two-speed, double-output gearbox, manually controlled for manipulating track laying vehicles, and includes a bevel gear set, clutch brake and geared steering systems, and full vehicle brakes.

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MIL-DTL-62460E

TABLE III. Clutch engagement.

Input speed

200 +20 rpm, CW 1/

Input speed

only

200 +20 rpm, CW only

port M vented

1380 +35 kPa

to steer unit sump

applied to port M

Shift

Steer

LH output

RH output

LH output RH output

lever

Lever

speed

position

positon

rpm

0 Steer

* REQT 1

Geared Steer

Full RH Steer

* REQT 1

* REQT 2

Full LH Steer

* REQT 2

* REQT 1

0 Steer

* REQT 2

Clutch Brake

Full RH Steer

* REQT 2

0 rpm

Full LH Steer

0 rpm

* REQT 2

Test Paragraph

4.6.3.6.1

4.6.3.6.2

* Requirements:

* REQT 1: The actual measured output rpm must equal the actual measured input rpm

divided by the geared steer gear ratio of 1.304. (Example: 200 � 1.304 = 153)

* REQT 2: The actual measured output rpm must equal the actual measured input rpm

divided by the clutch brake gear ratio of 1.926. (Example: 200 � 1.926 = 104)

1/ CW = clockwise.

LH = left hand.

RH = right hand.

3.4.13 Internal leakage at control valves and clutches. The input flow required at control

port M to maintain 1380 +35 kPa at control port M shall not exceed 11.4 L/min at any steer lever

position listed in tables IV or V (see 4.6.3.7).

3.4.14 No load input torque. The input torque required to maintain the following input

speeds, with no load at the output shafts, shall not exceed that specified in tables IV or V

(see 4.6.3.7):

a. In geared steer at 2500 rpm.

b. In clutch brake at 1800 rpm.