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Crane is a kind of widely used construction machinery, because of their poor conditions of use of wheel crane, so the failure rate is higher, the problems for must be fixed in a timely manner to eliminate, never allow the crane working in spite of illness.The fault of hydraulic wheeled cranes, mechanical failure, electrical fault and three categories of hydraulic system failure.

A crane hydraulic system

Crane by hydraulic power, is equipped with all kinds of hydraulic equipment.Common fault diagnosis and screening of crane hydraulic system are as follows:

1. Pressure does not rise
   Check the hydraulic oil tank: low oil level (empty), the hydraulic oil is spoiled or whether the oil pollution, whether the oil temperature is too high, as the case supplement or replace the hydraulic oil.Check hydraulic pump: speed is normal, directly to the overflow valve and pressure gauge from oil outlet test of hydraulic oil pump, check whether the parts for wear or damage to reduce the volumetric efficiency, depending on the feeling to be repaired.Check whether the overflow valve: due to the adjustment screw loose to lower pressure setting, seat surface is damaged or dust, the valve is stuck in the open position, the needle valve for wear and whether the spring deformation or damage, depending on the mood adjustment or repair.Check the swivel joint: sealing ring is damaged, the sleeve and the center shaft is damaged, depending on the repair or replacement.Check pressure gauge: inaccurate.
2. Hydraulic pump has abnormal noise
   Check the hydraulic oil tank: low oil level (empty), whether the hydraulic oil metamorphism, viscosity is too big or pollution, whether the oil temperature is too high, as supplement or replace the hydraulic oil.Check the hydraulic pump: whether installation bolt looseness, coupling, drive shaft is loose contact, whether badly worn or damaged parts inside;Whether inhaled air inlet pipeline, "as fastening or repair.
3. Hydraulic pump is overheating
   Check if the hydraulic oil tank: oil level is low, the hydraulic oil is spoiled or contaminated, as supplement or replace the hydraulic oil.Check whether the hydraulic pump, is due to wear and tear to lower volumetric efficiency, whether due to wear and tear that card, "as for repair or replacement.When making diagnosis and screening, must abide by the following items.Homework before, should be to determine whether the hydraulic oil tank of liquid level window foot, according to the provisions below rules under the scribed line, it must be added.Refueling, must through the oil filter injection, and pays much attention to cannot be mixed in different type of oil or water is not pure substance.Oil filter cartridge after working 250 h, should be checked, and clean or replace if necessary.Hydraulic oil tank should be every half a month from the bottom of the oil drain mouth to remove the moisture and impurities, and every other year 2000 h (or work) to replace all the hydraulic oil (in the oil under the condition of not bad, can be appropriately extended oil change period).When the crane is in use at bad environment under the condition of operation, the oil change period should be shortened accordingly.Hydraulic system of the valve has been fully test before they go out, and has set up a adjust pressure and flow rate, must not just touched.All kinds of parts, especially the hydraulic system of the device, all dirt adhesion of avoid by all means.After the operation, be sure to remove dirt, oil and clean.

2. Crane outrigger system

To increase tyred lifting capacity of crane when lifting work, crane has a leg.Leg for solid and reliable, easy to scale, back when driving, extending to the work.Crane outrigger system of common failures are: leg slow or not move;The work of lifting oil cylinder piston rod retraction;When driving leg outstretched, etc.

1. Leg slow or does not move
   Check whether there is a fault of the hydraulic system,Check whether the overflow valve: due to the adjustment screw loose to lower pressure setting, seat surface is damaged or dust, the valve is stuck in the open position, the needle valve for wear and whether the spring deformation or damage, depending on the mood adjustment or repair.Check the hand operated valve: the valve stem for wear and valve internal damage, depending on the mood change;Check the oil cylinder, piston is stuck, the piston rod is bent, as replacement.
2. Lifting oil cylinder piston rod retraction during working
   Check hydraulic control one-way valve: the valve seat surface is damaged or there is dust, or piston valve is stuck in the open position, the spring is in good condition, o-rings are in good condition, depending on the repair or replacement.Check the leg lifting oil cylinder: seal o-rings for damage, the inner wall of the cylinder is scratch, as replacement or repair.
3. When driving leg outstretched
   Check the manual control valve (for leg) : hydraulic control one-way valve seat surface is damaged or dust, whether the hydraulic controlled check valve gets stuck, spring is damaged, situation and repair or replacement;Check the leg lifting oil cylinder: seal o-rings for damage or wear and tear, oil cylinder wall is scratched, depending on the repair.In the process of disassembling maintenance should be paid attention to the following:

1. Before repair, the first leg outside (such as pipe joint) clean;
2. On the open pipe connection must be cloth around it, to prevent impurities into;
3. On the piston and cylinder, etc must be clean, and dry;
4. Before assembly, inside the piston and cylinder, oil seal and so on have surface coated with hydraulic oil, for lubrication.
5. When on the piston assembly should be set in a circle, prevent oil seal was incident bad;
6. Install the check valve, tighten the joint torque shoulds not be too big, in order to avoid deformation of valve body, valve core and guide the piston movement failure;
7. Because the hydraulic controlled check valve has a reverse controlled open performance, play to prevent leg retraction of the insurance, so should attach great importance to the maintenance of the check valve.

3. Crane slewing system

Crane was able to put on weight to specify any spatial location within the scope of work, in addition to relying on hoisting mechanism to realize the weight of the vertical displacement, most also must rely on rotary movement for horizontal displacement.Rotary movement of the horizontal movement range is limited, the required power is small, is relatively simple, so it is widely used in most engineering crane, and also design the gratification of rotary, general can be arbitrarily in the left and right direction of rotation.Only on the specific crane, with all rotary swing mechanism or without slewing mechanism, and other institutions to adjust the space position.In fulfilling the rotary motion, turning parts of the crane and the rotating part of the force between the device known as the rotary bearing device, driving center rotating joint is called slewing mechanism.Crane slewing system of common failures are: slow or motionless, turntable turned motionless, clearance is too large, such as rotary system.

1. Rotary system slow or motionless
   Check whether there is a fault of the hydraulic system,Check whether the overflow valve: due to the adjustment screw loose, reduce setting pressure, valve seat surface is damaged or dust, the valve is stuck in the open position, the needle valve for wear, whether spring deformation or damage, depending on the mood adjustment or repair.Inspection manual control valve: the valve stem for wear and valve whether internal damage situation and repair;Check whether the slewing reducer, gear or worm gear, worm is damaged: "as replacement or repair;Check the hydraulic motor: plunger or bearing is stuck, whether to lose efficacy by wear serious, output shaft is broken, depending on the repair or replacement.
2. Turntable turned to be not moved
   Check whether hydraulic motor: internal parts wear and tear, "as replacement.
3. Rotary system clearance is too large
   Check whether the slewing reducer worm gear, the drive gear: is wear and tear, "as replacement.Check whether slewing ring gear: wear and tear, "as replacement.

Zhengzhou Kebu Technology Co.,Ltd. Is China's domestic engaged in narrow space with mini crawler crane (Small crane) production of professional manufacturers.Company production of mini crawler crane with independent intellectual property rights, patent number: ZL 2009 2009 X.And has a number of mini crawler crane patent production technology.Mainly used in the narrow space of the car engine workshop equipment maintenance, electric power maintenance, chemical workshop maintenance, building curtain wall installation, the construction of the high speed rail station, and cemetery stone industry situations in the narrow space.If you are interested in our products, please contact us, the hotline: 0371-6371, 6261