Section 2. Extend and furl the hydraulic crane

WARNING Јє When stabilize the crane,put out all the activity legs,the leg cylinder and the wheels all touch the earth.

The hydraulic crane spread.

WARNING Јє when the hydraulic crane delivery there are A,B two point support,as the follow picture.

(A) (B)

A fixed on the fix leg, prevent the leg turntable.

WARNING Јєwhen the crane delivery(leave factory),there is a lock, only open the lock, the crane can work, if not the steel of the crane will broken, like the left picture above.

B the second knuckle boom cooperate with the turntable, the turntable support the second knuckle boom, prevent the boom go down.

 

The process of extend the knuckle crane:

1.Make the second knuckle boom absolute furl, let the support point(picture B) open.

2. make the first knuckle extend.

3. extend the second knuckle.

ATTENTION Јє operator must take care of the boom and the rotation unit base.

 

The telescopic boom operate Јє

Before hoisting the goods, the operator need estimate the weight of the goods.(the same as the rated lifting moment) and count the point of fall.

When put down the goods, the operate need slowly, exactly, not swing, and carefully prevent bump the truck and the crane.

In order to improve the natural life of the turntable, prevent hoisting the heavy goods turn. Before turn shorten the boom.

When hoisting the goods,prevent abruptly stop and begin, this can concussion the hydraulic structure.

ATTENTION Јє the telescopic boomЎЇs joy stick is the same one.

The furl of the hydraulic crane.

 

 

Furl the telescopic boom: absolute furl the telescopic boom.

ATTENTION ЈєDo not move when the crane working.

Adjust turntable positionЈєturn turntable until the first knuckle boom level with the fixed leg.

WARNING ЈєWhen the first knuckle boom level with the fixed leg. the arrowhead on the turntable and the rotation unit base must uniform.

 

Furl the second knuckle boomЈєabsolute furl the knuckle boom.

Furl the first knuckle boom: make the firstly knuckle boom slowly down, the firstly head knuckle boom of preventable rotation unit should be fixed on the relative units of fastness supportive legs, refers to left chart as below

 

 

Furl the activity legsЈєopen two of the safety valves on the legs cylinder,operate the leg cylinderЎЇ joy stick, furl the left and right legs cylinder, lock all the safety valves on the legs cylinder(close).then open the lock on the activity legs, then furl it and locked it.

WARNING Јє Activity leg must absolutely furl.

ATTENTION Јє Make sure the activity absolutely furl, and lock it.

CAUTION Јє 1. Hydraulic pump without connection with force equipment after complete work

2. After operation, check the control levers to ensure they are automatically reset. If any lever is not back to its central position, manually reset it to the central position.

Use the manual boomЈЁchoose adjunctЈ©

Manual boom setting Јє in order setting the manual boomЈthe boom stay as the picture show, so that is easy to operate.

WARNING Јє If you want to make the hydraulic crane reach the rated capacity of the hydraulic telescopic boom, the manual telescopic boom will be removed

WARNING Јє this course need two people assist.

 

THE PICTURE AS FOLLOWSЈє

Install the manual telescopic boom and lock it.

ATTENTION Јє Ensure to make the spring replaced certainly.

 

 

 

Manual boom back out.

Attention Јє must rememberЈwhen open the lock, the manual boom will slide to one point, so the people need stand outside the manual boom, prevent hurt people.

 

Crane Service

The crane shall be regularly examined and serviced to ensure that parts and components, especially safety devices, are in good condition and function properly.

1.Check the driving circuit connections.

Check the entire hydraulic power driving pipes and make sure they are free of leak and distortional deformation.

2.Check the hydraulic oil level

Check the oil capacity in the tank, oil level will not high up or low down the max. or the min. marks.

Chapter 7. Troubleshooting

 

Trouble	Cause	Correction
Telescopic oil cylinder shocks and the telescopic boom creeps.	1Ј©Air exists in the hydraulic system. 2Ј©Telescopic oil cylinder seal is deteriorated. 3Ј©Dirt in the balance valve.	1Ј©Set the crane in noload mode. Exhaust air from the system by repeatedly moving the executive elements to their limit positions. 2Ј©Replace the oil cylinder seal. 3Ј©Clean the balance valve.
Operating speed is too slow in unload condition.	1Ј©Suction pipe becomes flat due to external squeezing. 2Ј©Air is taken into the oil suction pipe.	1Ј©Replace the pump. 2Ј©Tighten the connector of the suction pipe.
The Hydraulic Crane fails to reach the rated lifting capacity	1Ј©Power of the hydraulic pump is not sufficient. 2Ј©Overflow valve is not properly set. 3Ј©Hydraulic pump seal is damaged.	1Ј©Replaced the pump. 2Ј©Readjust the pressure of the overflow valve(down by the valve manufacture). 3Ј©Replace the seal.
The lifting boom automatically lowers after the load is lifted	1Ј©Variable-amplitude cylinder piston seal is damaged. 2Ј©Throttle port of the balance vale is blocked or the return spring fails due to fatigue	1Ј©Replace the seal. 2Ј©Clean the valve,remove the dirt or replace the spring.
Hydraulic Crane fails to rotate properly	1)Hydraulic Crane exceed allowed the Max gradient 2Ј©Dirt in the cushion valve of the rotation mechanism. 3Ј©Speed reducer of the rotation unit out of pace.	1)Put the track crane into the allowable range of inclined errors. 2Ј©Clean or replace the cushion valve. 3Ј©Adjust the speed reducerЎЈ
Abnormal sound is heard at linkage points or rotation mechanism	Need lubrication.	Supply lubricant according to specified interval.
Oil cylinder leaks, either externally or internally.	End cap seal is deteriorated or damaged. Piston O-ring wears out.	Replace the seal parts.
Excessive noise, pressure surge or hydraulic valve sound.	1Ј©Suction pipe or strainer is blocked. 2Ј©Oil viscosity is too high. 3Ј©Air enters the oil pipe due to poor seal at oil inlet. 4Ј©Parts wear inside the pump. 5Ј©System pressure is too high.	1Ј©Clean the strainer and remove the dirts. 2Ј©Replace the hydraulic oil as specified or preheat the oil with heater. 3Ј©Replace the seal part and tighten the fixing screw. 4Ј©Repair or replace the worm parts. 5Ј©Readjust the system pressure.

Chapter 8. Maintenance