Special truck cranes 9T31M and 9T31M1 with the lifting capacity of 7t on the chassis of a car with high cross-country ability Ural-375 are designed for loading and unloading discharge cargo and for installation work. The 9T31M1 crane has the same technical characteristics (except for the weight) as the 9T31M crane, but differs in the availability of a set of equipment for installation, attachment and transportation of rigging (9T37 and 9T55A), in addition, the 9T31M1 cranes, produced after 1.03.1980, are equipped with a 030 cabin heater, and since 1.01.85. - have no counterbalance.
The cranes type is a special automotive boom with flexible boom suspension, fully rotatable on the chassis of the Ural-375. Crane calculation - at least two people. The crane's boom is retractable. Crane drive - mechanical from the car engine. Maximum power consumed by the crane - 13.2 kW (18 hp) Calculated mode of operation of the crane - easy, with a number of cycles of continuous operation not exceeding 50. Subsequent operation of the cranes is allowed only after the belt brake pulleys have cooled down completely to ambient temperature. The crane's maximum travel speed is determined by the speed allowed by the vehicle, depending on road conditions. The crane must operate without failure within the ambient temperature range of -40° to +40° C. Crane support jacks (outriggers) - mechanical, screw, folding. Distance between support jacks: across the machine - 3.5 m; along the machine - 3.1 m. Since 1.01.85 the distance between the front supports has been increased from 3.5 to 3.74 m. The distance between the rear supports remained unchanged The crane design used parts and assembly units of cranes AK-5G, AK-75, AK-75B, KS-2561D, KS-2561K.
A special truck crane consists of a running gear and a crane unit. The running gear of the crane is the chassis of a car with high cross-country ability Ural-375.
For crane installation the chassis of the base vehicle is re-equipped as follows:
- the fuel tank mounting brackets have been replaced and the fuel tank has been moved forward to the cab;
- the bonnet latch has been installed;
- the lever for the vehicle clutch control from the crane system control cabin is welded to the clutch lever;
- the decoupling crane and the flexible tire inflation hoses were moved;
- the position of the exhaust pipe has been changed;
- installed locking device in the control of the auxiliary power take-off box.
The crane system consists of a slewing and rotating part and is divided into the following main functional groups.
- Carrier assembly units:
- supporting frame;
- hanging unit;
- supporting frame; hanging unit; slewing gear;
- swivel frame;
- portal;
- boom support.
- The working equipment:
- extendable boom;
- hook.
- Power transmission:
- primary gearbox;
- junction box;
- boom lift mechanism (jib crane winch);
- load lifting mechanism (crane cargo winch);
- crane turning mechanism;
- connecting shafts and couplings.
- Crane system control:
- controls;
- control cabin.
- Safety devices.
- Electrical equipment, means of communication, dimming and light-signalling.
The supporting frame with folding supports is reinforced on the car frame. The supporting frame is equipped with a slewing support device, which is a large diameter thrust ball bearing and is the basis for the slewing part of the crane. The support frame with the slewing support unit mounted on it and the power transmission elements (primary gearbox and PTO shaft) form the slewing part of the crane system. Vessels also include a hanging device designed for lifting (hanging) the rear axle trolley while the crane is in operation, and a boom support to keep the latter in transport position. The slewing part of the crane unit consists of a slewing frame with a gantry fixed on it, an extendable boom with hook cage, junction box, jib winch, crane rotation gear and control cabin. The swivel part can rotate through 360° in either direction. To increase the stability of the crane during operation, a cast iron counterweight weighing 300 kg is mounted on the swing frame. From 1.01.85 to reduce metal consumption on the crane 9T31M1 is excluded counterweight (0000-29).
Boom and load lifting mechanisms are equipped with two brakes each: a belt brake, permanently closed with a ratchet mechanism, and a load-resistant one. The crane's slewing gear is equipped with a belt permanent brake.
The following safety devices are available on the crane:
- boom-lift limiter;
- a lifting limiter for two characteristics - main and additional;
- hook height limiter;
- hook out indicator from the swivel axis of rotation;
- sweeper;
- roll signalizer;
- audible alarm;
- load rope tension limiter.
The crane has an intercom system for three subscribers to communicate. For heating the control cabin on the crane slewing frame 9T31M1 from 1.03.1980 a heater is installed. The crane control cabin is also controlled by three levers and two pedals. The clutch pedal is designed to control the clutch of the vehicle. The accelerator pedal is connected with the carburetor throttle flap of the vehicle. Changes in the direction of movement of all crane operating elements are made with the reversing lever. The control lever on the cargo winch is used to activate the cargo winch. The control lever for the boom winch and swing mechanism is used to activate the boom winch or the crane unit's swing mechanism.
The crane is powered by a single-wire circuit. All consumers are powered, and except for the intercom and electromagnet of the clutch-operated air crane, by a 12V battery of the base vehicle. The intercom and the electromagnet of the air crane of automatic clutch shutdown are powered from the battery of the base vehicle and the additional battery in the cab of the crane, connected in series to a common battery to increase the voltage up to 24V.
In the event of engine failure, the crane can be moved to the hiking position by means of the crane's manual drive unit, which is available in the crane's timing system.
The vehicle crane 9T31M1 differs from the crane 9T31M by the availability of a set of equipment for attaching and transporting rigging on the crane and a heater 030. The heating unit is designed for heating the control cabin and is mounted on brackets behind the control cabin. The heater is connected to the control cabin by a duct.
The rigging equipment is included in the set:
- a lift designed to be mounted on a crane or removed from the crane rails. The lift has a load capacity of 300 kg.
- assembly units and parts for attaching to the rigging crane - 9T37 and 9T55A.
The traverse 9T37.01 or 2U663 Sb.11A1 is installed on the swinging supports of special transverse beams, under the right (in the course of the machine) decking of the support frame, and pressed to them with the clamps. When moving without a cross-beam and when the cross-beam is removed, the clamps are fixed to the base frame deck. The crossbeam AE.747.001-1 is installed on the rear beam of the support frame. Earrings AE.747.013 (2 pcs.) can be installed on the crossbeam or stacked together with slings AE.736.002 in the drawer at the rear of the swivel frame on the left (behind the crane operator's cabin). Sections of 9T37.02 bandages are fixed to the outer surface of the box. 2Sh15 bandages, 9T55-80.53.000 bag with tools, AE.736.003 slings with AE.747.013 earrings and other rigging elements are placed in the box. Box with a set of replacement parts is mounted on the front deck of the support frame. The C4313 device is stacked in a box for a single ZIP.
When installed on a railway platform in a camping position, the truck crane fits into the outline of the loading of the USSR railways, the size 1-T in the size of the rolling stock of Western European railways 02-T crane in a camping position does not fit (it is necessary to remove the control cabin and other elements).
Technical specifications
| Dimensions in transport position, m: | |
| - length | 8,2 |
| - width | 2,7 |
| - altitude | 3,8 |
| Working weight of the crane without calculation, kg: | |
| - 9Т31М | 13200 |
| - 9Т31М1 | 13380 |
| - 9Т31М1 corded | 13800 |
| Weight distribution, kg: | |
| - front axle | 3900 |
| - on the rear bogie 9T31M | 9300 |
| - on the rear bogie 9T31M1 | 9480 |
| - on the rear bogie 9T31M1 with rigging | 9900 |
| The length of the arrow, m: | |
| - up and running | 8,0 |
| - hiking | 5,1 |
| Carrying capacity, t: | |
| - when the hook is off the axis of rotation 3.4m | 6,8 |
| - when the hook is off the 7.6 m axis of rotation | 1,8 |
| - on additional specification * when the hook is off the axis of rotation 3.4m | 7,0 |
| * the additional characteristic is automatically switched on only when the crane boom is set in the rear position along the vehicle, against the vehicle's course, at the hook outings in the range of 3.4 - 4.3 m | |