Model	DHS 1200L
Revision	04
Date	2009.1.28

 

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DHS 1200L Hydraulic Crane Leader 1. Terminology Diagram/DHS 1200L  

  

 

No.	Description	No.	Description
1	Unit	12	Platform
2	Front Outrigger	13	Outrigger Control Lever
3	Column	14	Receiver
4	Oil Tank	15	Deck Partition
5	1st Stage Cylinder (Derrick Cylinder)	16	Leveling Cylinder
6	2nd Stage Cylinder (Telescopic)	17	Winch (Option)
7	Rotary Cylinder	18	Rear Outrigger
8	1st Stage Boom	19	Work Lamp
9	2nd Stage Boom	20	Control Box (Connecting Terminal)
10	3rd Stage Boom
11	4th Stage Boom

 

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DHS 1200L Hydraulic Crane Leader 2. Working Radius/DHS 1200L 

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DHS 1200L Hydraulic Crane Leader 3. Specification

Specification of DHS 1200L
No.	Description			Standard
1	Product Name			DHS 1200L Platform Type
2	Manufacturer Name			DONGHAE MACNIHERY& AVIATION Co., Ltd
3	Dimension (L x W x H)			3,653(mm) x 1,610(mm) x 2,078(mm)
4	Permissible Vehicle for Mounting			Not less than 1.2 MT truck
5	Maximum Work Height			11.6m (To the bucket top)
6	Maximum Side Reach			8m
7	Boom Type		1st Stage	Fixed Type   Articulated   Telescopic
			2nd Stage
			3rd & 4th Stage
8	Boom Material		1st Stage	High tensile Rectangle Steel 2 Row   High tensile Hexagonal Steel   Hexagonal Aluminum
			2nd Stage
			3rd & 4th Stage
9	Rotation Angle/Speed			Clockwise 180° & Counter clockwise -180°
10	Rotation Device			Hydraulic Cylinder
11	Platform	Material		F.R.P (Fiberglass Reinforced Plastic)
		Dimension		1,000 x 645 x 1,000(mm)
		Swing Angle		180° / Manual Wheel Bar
		Leveling		Auto horizontality by Hydraulic Cylinder
		Load Capacity		240kg (Including Operator)
		Occupancy		2 Personnel
		Feature		Platform Tilt & Arc Rotation
12	Winch (Option)			300 kg / Single line   600 kg / Double line
13	Operation Method			Wire or Wireless Transmitter
14	Front Outrigger			Auto-Horizontal & Vertical Extending Type
15	Maximum Outrigger Span			3.2 (m)
16	Hydraulic Oil Reservoir Capacity			35 (ℓ)

 

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DHS 1200L Hydraulic Crane Leader 

No.	Description	Standard
17	Emergency System	Emergency Manual Valve (Standard)   Emergency Hydraulic Unit (Option)   Interlock System (Order Made Option)
18	Operation Method	Transmitter
19	Safety Devices	Relief Valve, Counter Balance Valve, Proportional  Control Valve, Platform Safe Angle Control Valve,  Pilot Check Valve, Vehicle Overturning Preventer,  Column Swing Fixing Device, Overload Check  Sensor

 

 ALL TECHNICAL SPECIFICATION IS BASED ON STANDARD ITEM  OF DONGHAE MACHINERY & AVIATION Co., Ltd.  

 IT IS SUBJECTED TO CHANGE FOR THE IMPROVEMENT OF THE  QUALITY WITHOUT PRIOR NOTICE. 

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DHS 1200L Hydraulic Crane Leader 4. Overall Dimension  

◆ Truck Specification may be different up to customer’s selection. 

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DHS 1200L Hydraulic Crane Leader 5. Main components  

 (1) Unit;  

1) Unit is designed for fixing this crane to vehicle and it is connected with swing part of the  crane.  

2) The part for fixing base and vehicle is fixed by special steel bolts with heat treatment.  3) Column is mounted over the bearing of rotary shaft.  

Rotation system is driven by rack gear and spur one. Hydraulic cylinder pushes rack gear and  the rack gear rotates spur gear and then it makes the column rotated.  

Rotation angle is 0°∼ 180°and 0°∼(-180°).  

  

(2) Outrigger:  

1) There are two set of outriggers in this unit, one in front and the other in rear.  

2) Manual valve lever controls raise and lowering the outriggers and extending & retracting of  the outriggers are operated by automatically or manually according to option.  3) The outriggers are composed of beams and legs. The appearance of beam is rectangle and a  double-acting cylinder is used.  

4) To prevent shake of the vehicle, the outriggers are used when the unit operates.  5) Pilot check valve prevents up & down joggle of the outrigger legs and prevents also tilt of the  vehicle when hose breakage happens.  

(3) Column;  

1) The column is assembled with rotary bearing on the frame and connected with the 1st stage  boom.  

2) In the inside of the column, there are solenoid valve and block to discharge and distribute  hydraulic oil to every cylinder. Also a buzzer is inside to make a sound and notify the control  device works. And there are switch, fuse, work lamp switch and receiver outside of the platform.  

(4) Oil Tank;  

1) The oil tank locates at the floor of base and its capacity is 35 liters.  

2) Oil amount is shown at the oil gauge of the side of oil tank. Make sure the oil amount always  should be over the maximum limit of the oil gauge.  

3) There are one oil feeder, one oil filter and a drain outside of the tank and another oil filter is 

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DHS 1200L Hydraulic Crane Leader inside of the oil tank.  

4) Hydraulic oil influences the expected life span of the main components of the unit.  (5) Boom System;  

1) The booms are composed of 1st, 2nd, 3rd and 4th stage boom.  

2) The 1st stage boom is fixed to the column by pin and a buzzer is inside of the column.  

3) The 2nd stage boom is fixed to the 1st stage boom and bended by the 1st stage cylinder. The  articulated angle is -25 ~ 80 degrees.  

4) The material of 1st & 2nd stage boom is high tensile steel and 3rd & 4th stage boom are  made of high tensile aluminum they have been fully tested and manufactured for the unit.  5) The 2nd stage cylinder extends and retracts the 3rd & 4th stage booms inside of the 2nd stage  boom. And the length is 4,800mm.  

 (6) Platform; 

As a hydraulic cylinder is adopted, platform keeps horizontality automatically according to  change of boom angle. It is also possible of free arc rotation in 180 degrees and platform tilt is  available in an emergency case and removing garbage of the platform. If there is angle deviation  of the platform, it can be controlled and adjusted by a transmitter.  

(7) PTO; 

The oil pump is driven by the P.T.O via  

Propeller shaft. The P.T.O conversion switch  

box locates at the cabin of the vehicle.  

① P.T.O Switch Box  

② P.T.O Lamp  

③ P.T.O Switch  

④ P.T.O Fuse 

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DHS 1200L Hydraulic Crane Leader 5. Safety Devices 

 (1) Proportional Valve;  

It prevents rapid movement when the unit operates and makes the cylinder operated smoothly.  

(2) Pilot Check Valve and Counter Balance Valve;  

These prevent boom falling abruptly if there is a hydraulic line failure or cutting off.  

(3) Vehicle Overturning Prevention Device;  

1) Swing angle check sensor  

If the vehicle tilts more than 3 degrees to the front and the boom swings in 120 degrees to the  

front side of the vehicle, the swing is limited as the swing angle check sensor is connected with  a front angle check sensor.  

2) Vehicle side angle check sensor  

When platform is overloaded and the vehicle tilts more than 2 degrees in right or left side, the  movement of boom and column are limited.  

3) Vehicle front angle check sensor  

It perceives the tilt of the front side of the vehicle and when the vehicle tilts more than 3 degrees,  the movement of boom and column are limited.  

(4) Overload Check Sensor;  

It makes alarm sound and shut down the movement when lifting an overloaded material beyond  rated capacity with winch.  

The more closer to the vehicle with fully retracted boom, the more heavy material can be lifted.  

(5) Auto Leveling Cylinder;  

It makes horizontality of the platform automatically.  

(6) Lock Catch;  

It prevents boom rotation itself when the vehicle is traveling.  

 (7) Alarm;  

It makes alarm sound when safety device is working.  

Stop operation and remove the cause of the alarm sound.  

(8) Swing Angle Check Sensor;  

If the vehicle tilts more than 3 degrees in the front and the boom swings in 120 degrees in the  front side of the vehicle, the swing is limited. 

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DHS 1200L Hydraulic Crane Leader (9) Safe Angle Deviation Preventer of Platform;  

When occupying the platform and the platform tilts over 10 degrees up and down, the platform  movement is limited.  

(10) Emergency Manual Valve:  

1), Its usage is for the case that battery and transmitter are out of order when the engine is on.  2), Before operating, contact with headquarter or A/S center for more safe work.  3), Detach the Emergency manual valve cover from column.  

4), Lock the metering valve located on behind outrigger manual valve.  

5), Check the label on column, expect the crane operation.  

6), Make the equipment return to safe condition by operating the lever as slowly as it can.  7), Get the metering valve to the original position.  

(11) Emergency Hydraulic Unit (Option):  

1), When you have to operate the unit under the engine failure, use the emergency pump.  Pressing the pump do the operation what you have to do.  

2), Do not operate the unit under the engine failure except an emergency case. (The battery  could be discharged and it will cause hazard to the unit.) 

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DHS 1200L Hydraulic Crane Leader 6. Efficiency of the control (Wire/Wireless transmitter) 

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DHS 1200L Hydraulic Crane Leader 

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