MIL-T-62110 Trucks, Maintenance: With Rotating Hydraulic Derrick, 32,000 To 44,500 Gvw, 4X2, 4X4, 6X4, And 6X6, CommercialThis specification covers maintenance trucks with a rotating and telescoping hydraulic derrick. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-62110G

rotating the derrick with the vehicle up and down a 15 percent grade at all derrick positions and loads listed in table III without any vehicle wheel leaving the ground and without permanent deformation of any part.

3.3.6 Horizontal load. The turret and derrick shall be capable of rotating against a horizontal load, at right angles to the derrick, of sufficient force to produce a torque of not less than 21,000 foot-pounds for size 55 and 37,000 foot-pounds for size 70 without opening the turret rotation hydraulic relief valves and without permanent deformation of any part. The turret shall be provided with hydraulic relief valves preventing rotation against a horizontal load, at right angles to the derrick, that would result in permanent deformation of any part.

3.3.7 Position holding ability. The turret and derrick assembly shall be capable of remaining in a fixed position and of controlled lowering when the hydraulic motor is

de-energized. With the vehicle longitudinal on a 15 percent grade and the derrick transverse, the

turret and derrick shall hold, in all positions and load combinations specified in 3.3.4, without more than 1 inch per hour horizontal creep and without more than 2 inches per hour vertical settling, both measured at the centerline of the upper head sheave.

3.3.8 Performance with aerial basket(s). With the basket(s) loaded with twice the payload specified in 3.7.3, the derrick shall perform as specified in 3.3.3 through 3.3.7 through all positions it is capable of attaining without any wheel of the vehicle leaving the ground and without the permanent deformation of any part.

3.4 Chassis components.

3.4.1 Engine. The engine furnished shall be the chassis manufacturer's standard or optional engine for the commercial model vehicle which meets or exceeds the requirements of this specification.

* 3.4.1.1 Diesel engine. Unless otherwise specified (see 3.4.1.2), the vehicle shall be equipped with a liquid cooled, compression ignition, two stroke or four stroke cycle diesel engine, with not less than four cylinders. The engine net horsepower used in performance prediction calculations shall be determined in accordance with SAE J1349. The engine shall demonstrate the performance characteristics specified herein when using diesel fuel conforming to VV-F-800. In addition, when specified (see 6.2), the engine shall operate satisfactorily on grade JP-4 and grade JP-5 fuel conforming to MIL-T-5624 under emergency, short duration conditions and on grade JP-8 fuel conforming to MIL-T-83133 under normal conditions. A power loss when operating on JP-4, JP-5 or JP-8 is acceptable. A test report shall be available showing that a representative engine of the same model has been tested and certified to meet the requirements of NATO AEP-5 (400 hours dynamometer test to assure JP-8 compatibility.)