CG938H Wheel Loader. Manual - part 23

 

94

Starting of Engine 

Normal starting: this loader is started under neutral gear protection, i.e. when the 
transmission operating rod is not at the position of neutral gear, the engine cannot be started. 

1.  Turn on the battery disconnect switch in the left box in the counter weight; 

2.  Make the shifting handle at the position of neutral 

gear; 

3.  Make the parking brake at the position of closure. 

4.  Make the control rod of working device at the 

position of keeping.Insert the key to turn on the 

preheat start switch, and then turn the preheat start 

switch to start the engine. 

 

 

注          意 

The starting time of the engine shall not exceed 5 seconds. Prior to restarting, the 

starting motor shall be cooled for 2 minutes. 

 

Starting of external power source 

Warning 

The accumulator can release the explosive flammable gas. 

Any spark near the accumulator is not allowed. The volatile gas produced by the 

accumulator will cause explosion. Mutual impingement of external power sources or of with 

loader is not allowed. 

No smoking as the level of electrolytic solution is examined. 

The electrolytic solution is acidic and will harm skin and eyes. After touching the 

accumulator and pile head, wash your hands. While maintaining the accumulator, it is 

suggested wearing gloves. 

While starting with the external power source, wear protective glasses. 

Improper connection of the external power source will cause explosion and personal 

injury and death. 

The anode (+) and cathode (-) of the accumulator shall be connected with the one 

respectively. 

Battery 
Disconnect    
SW 

 

95

The voltage of the external power source shall be consistent with the one of the loader, 

and the power source shall be the accumulator power source. 

Caution 

As another machine is used for starting, two machines shall not be contact each other so 

as to prevent the damage of the engine and electrical circuit. 

Use of external power 

Make a primary diagnosis for the loader that fails to start. 

1. Turn the joy stick of the transmission box of the choke to neutral position. Put all working 

devices down. All joy sticks are placed at the holding position. 

2. Turn the key switch of the choke to the central position and turn off all instruments and air 

conditioning etc. 

3. Help the started loader close the choke so as to facilitate wire connection. But two loaders 

shall not contact each other. 

4. Help to turn off the engine of the started loader. If the auxiliary power source is used, the 

charging system shall be turned off. 

5. Give attention to whether the wire connection of the accumulator is correct and tightened. 

5.  Connect the anode (+) of the external power source to the anode (+) terminal of the 

discharged accumulator or the accumulator of choke. 

Note:  The accumulators connected in series are installed in the same accumulator box. Use the 

terminal connected with the starting motor. The accumulator and starting motor are situated at the 

same side of the loader.   

Any metal shall not contact the anode wire clip. 

6.  Connect another anode of the external power source (+) to the anode helping the starting of 

the accumulator. Identify the correct connector lug with the method of Step 6. 

7.  Connect cathode of the external power source (-) to the cathode helping the starting of the 

accumulator.  

8.  Lastly, connect another cathode of the cable to the frame (not the cathode column of the 

accumulator). The connection position shall be kept away from the accumulator, fuel, 

hydraulic pipe or moving elements. 

9. Start the engine that helps starting of the loader or close the charging system assisting in 

starting. Two minutes at least are required to shut down partial charging of the loader. 

 

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10. Try to start the choke. Please refer to “Starting of Engine”. 

11. After starting the flameout engine, the external power source shall be shut down 

immediately in the reverse order. 

12. Summarize the causes for starting or charging failure of the choke. Now, the engine works 

and the charging system works normally. 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

97

After Starting the Engine 

Caution 

Keep the engine run at a low speed until the pressure of the engine oil pressure gauge is 

normal. If there is no engine oil pressure within ten seconds, the engine shall be stopped for 

the examination over causes, or not, the engine will be damaged. 

 

1． Five-minute low-speed unload idling is required to heat the engine. Operate all joy sticks to 

accelerate the preheating of the hydraulic components. 

2． In operation, observe whether the instrument stays within the normal range. 

In idling and preheating of the engine, the following items shall be noted: 

z  In case the temperature is 0℃ above, the pre-heating time lasts about 15 minutes. 

z  In case the temperature is 0℃ below, the pre-heating time lasts about 30 minutes. 

z 

In case the temperature is -18  below or fluidity of the hydraulic oil is poor, long preheating 

℃

time is required.

 

Warning 

After starting and preheating of the engine, if the low brake pressure alarm lamp lights continuously, the 

engine shall be stopped immediately for examination. After the alarm lamp lights off, the engine may be 

operated, or not, your driving safety would be endangered. In case the brake pressure alarm lamp lights during 

the period of drive, it shall be stopped immediately for examination.