Pipe Layer CHETRA 221 machine

ENGINE
Cummins M11-C260 V6, four-stroke, turbocharged, liquid cooled engine.

Cylinder bore and piston stroke -125 mm x 147 mm.
Engine displacement -10,8 L.
Operating power - 21 OkW (286 h.p.) at 1950 rpm.
Maximum torque, not less than 1288Nm at 1200...1400 rpm.
Full-flow oil cleaning system with one replaceable paper filtering element. Liquid -oil heat exchanger for engine oil cooling. A "pushing" type fan with a fan belt drive. Heat condition control is run by the thermostat. Transmission oil cooling is run by engine cooling liquid in the heat exchanger mounted separately from engine. An anticorrosive filter is used in the cooling system.

GERABOX
Planetary-type gerabox, to be shifted under load, with clutches of 415 mm diameter, operating in oil and having high capability of transmitting the torque, providing three forward gears and three reverse ones. As per design, it is connected with a matching reducing gear and the main drive forming a single power unit to be mounted in a rear axle housing. Three element one-stage torque converter of 410 mm efficient diameter, Ko=2,9 maximum trans-formation coefficient, with a pump drive reducing gear, is connected with a gerabox by a spline clutch and is mounted at the front wall of the rear axle. The torque converter is connected with an engine by drive line and an elastic clutch mounted on the engine.

Gear Forward, km/h Reverse km/h
1 3,8 4,9
2 6,5 8,2
3 9,8 11,7

PIPELAYING EQUIPMENT
Load lining capacity-21 000 kg. Rated lifting capacity - 44 200 kg. Is designed for pipe laying into trenches and for other handling operations. Ratio of sheave blocks: of load sheave block - 4, of boom sheave block-4

Hook: The hook is triggered through sheave block system by the double-speed winch. Hook lifting height is 5,5 m. Hook lifting and lowering speed: " I gear (lifting and lowering speed) - 8 m/min " II gear (lifting and lowering speed) - 24 m/min Boom: a boom is a welded construction of box-like section. It is triggered through sheave block system by double-speed winch. Boom length is 6,5 m. Boom weight-1152 kg. Winch: Two-drum winch with hydraulic drive is hydraulically controlled. It has two gears and normally applied disk brakes.

Winch overall dimensions: Of a drum (diameter xwidth), mm - 400 mm x290 mm Rope sizes (diameter x length) of a hook -19,5 mm x 46 m, of a boom - 19,5mmx46m

Counterweights: Counterweights consisting of four plates, 1050 kg each are located on the counterweight frame. The counterweight is controlled hydraulically and consists of NSh50 pump, distributor and hydraulic cylinder of 125 mm diameter.

UNDERCARRIAGE
Track rollers frame: box section construction made of high-strength steel. Rollers and Idlers: track rollers, support rollers and idlers feature life-time lubrication and self-adjusting seal packages. The number of track rollers (from each side) -8. The number of support rollers (from each side) - 2.

Track chains: assembled with one-grouser track shoes and a seal package for retaining fluid lubricant in the hinge which helps increase the life time. The track chain tension can be easily adjusted using a grease gun. A pitch of a track link is 215,9 mm. The number of shoes (from each side) is 43. Grouser height is 70 mm. Shoe width is 610 mm. Ground contact area - 3,8 mz. Ground pressure, not more than - 0,86 kgf/cm2

BOOM AND HOOK DRUM DRIVE AND THEIR CONTROL
A boom and a hook winches are driven by hydraulic motors. Control of hydraulic motors is provided by distributor which enables rotation of boom and hook drums simultaneously at any gear and in any direction. A hydraulic system features double cleaning system with replaceable paper filtering elements and forms a single unit with transmission hydraulic system. Due to that temperatures in both systems of the pipelayer are universally maintained. Winch drives have planetary systems built- in drums as well as double speed gerabox with a normally applied brake and overrunning clutch to avoid brake release when moving uphill. Forced lubrication and cooling of bearings, pinions and brakes of a drive. The winch drive design allows replacing any module without dismantling the whole drive from the pipelayer.

OPERATING WEIGHT
Operating weight, not more than - 32 500 kg

CHETRA 221 with origianal Cummins (286 H. P) is a best Russian crawler pipe layer tested in biggest world-pipeline projects