This Article Introduces the Precautions For the Use of Doosan Excavator DX300LC Battery

 

                WARNING!

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Battery electrolyte contains sulfuric acid and can quickly burn the skin and eat holes in clothing. If you spill acid on yourself, immediately flush the area with water.

Battery acid could cause blindness if splashed into the eyes. If acid gets into the eyes, flush them immediately with large quantities of water and see a doctor at once.

If you accidentally drink acid, drink a large quantity of water or milk, beaten egg or vegetable oil. Call a doctor or poison prevention center immediately.

When working with batteries, always wear safety glasses or goggles.

Battery generates hydrogen gas, so there is danger of an explosion. Do not bring lighted cigarettes near the battery, or do anything that will cause sparks.

Before working with batteries, shut down engine and turn the starter switch to the "O" (OFF) position.

Avoid short circuiting the battery terminals through accidental contact with metallic objects, such as tool.

When removing or installing, check which is the positive (+) terminal and negative (-) terminal.

When removing the battery, first disconnect the negative (-) terminal. When installing the battery, first connect the positive (+) terminal.

If the terminals are loose, there is danger that the defective contact may generate sparks that will cause an explosion. When installing the terminals, install them tightly.

 

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Batteries in Cold Weather

In colder weather a greater drain is placed on the batteries when they are used for the preheat cycle and when starting a cold engine. Battery performance decreases as the temperature gets lower.

In extremely cold weather, remove the batteries at night and move them to a warm location. This will help to keep them at a higher power level.

                                                     

Inspection of Battery Electrolyte Level
This machine has two maintenance free batteries. They never require the addition to water.
When the charge indicator becomes transparency, it means low electrolyte state because of the leakage or charging system error. Determine the cause of problem and replace the batteries immediately.

Check Charging State

Check charging state through the charging indicator.

• GREEN: Sufficiently charged.

• BLACK: Insufficient charged.

• TRANSPARENT: Replace battery.

 

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Check the Battery Terminals

Be certain that the battery is held securely in its compartment. Clean the battery terminals and the battery cable connectors. A solution of baking soda and water will neutralize acid on the battery surface, terminals, and cable connectors. Petroleum jelly or grease can be applied to the connectors to help prevent corrosion.

 

 

Battery Replacement

When the charging indicator indicates transparency state, replace the battery. The batteries should always be replaced in pairs.

Using an old battery with a new one will shorten the life span of the new battery.

Disassembly and inspection method of main components of Hitachi excavator diesel engine --- cylinder head cover

Disassembly and inspection of main part of Hitachi excavator ZX200-3 excavator 4HK1 diesel engine

 cylinder head cover (1) Structure (1) The cylinder head cover assembly of 4HK1 diesel engine is shown in Figure 3-3-1. 

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   (2) The cylinder head cover assembly of 6HK1 diesel engine is shown in Figure 3-3-2. 

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 (2) Disassembly

  (1) Remove the cylinder head cover. See Figure 3-3-3 for the cylinder head cover of 4HK1 diesel engine, and Figure 3-3-4 for the cylinder head cover of 6HK1 diesel engine. 

 

  

 

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 (2) Remove the gasket.

  (3) Remove the injector harness connector. 

 (4) Remove the cylinder head cover. See Figure 3-3-5 for the cylinder head cover of 4HK1 diesel engine and Figure 3-3-6 for the cylinder head cover of 6HK1 diesel engine  

 

 

  

 (5) Remove the gasket. 

       (3) Installation 

 (1) Install the gasket on the lower cover. 

 (2) Install the cylinder head cover, tighten the cylinder head cover, tightening torque: 18N m (4HK1 diesel engine), 13N m (6HK1 diesel engine).  

(3) Install the fuel injector harness connector, and insert it completely until the lock claw is lifted. 

 (4) Install the gasket to the cylinder head cover. 

 (5) Install the cylinder head cover, see Figure 3-3-7 for the installation of the cylinder head cover for the 4HK1 diesel engine, and 3-3-8 for the installation of the cylinder head cover for the 6HK1 diesel engine. Tighten the bolts in the order shown in the figure, tightening torque: 18N.m (4HK1 diesel engine), 13N.m (6HK1 diesel engine). 

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Introduction to the Structural Features of SAA6D125E-3 and SAA6D107E-1 Diesel Engines for Komatsu Excavators (PC400-7 and PC200-8)

 (1) Overall structure diagram The structure of SAA6D125E-3 diesel engine is shown in Figure 2-3-1, and the structure of SAA6D107E-1 diesel engine is shown in Figure 2-3-2.

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    (1) SAA6D125E-3 diesel engine complies with strict emission regulations: US EPA standard (2001 regulation), European regulation 2002, Japanese construction equipment regulation 2003, it is a diesel engine with high performance, high efficiency, low fuel consumption and low noise, Improved exhaust color, improved acceleration. 

 (2) SAA6D125E-3 diesel engine and SAA6D107E-1 diesel engine are both in-line, 6-cylinder, water-cooled, direct-injection diesel engines. 

 (3) SAA6D125E-3 diesel engine and SAA6D107E-1 diesel engine adopt electronically controlled common rail fuel injection system, which injects high-pressure fuel at a pressure of 118MPa, which can provide the best injection control to match the speed and load, thereby improving Diesel engine emission performance, reducing fuel consumption and noise. 

 (4) The piston is made of high-quality steel, cast in a vibratory cooling furnace, and has the lowest thermal expansion in Komatsu tradition, which improves the reliability and life of the diesel engine. 

 (5) SAA6D125E-3 diesel engine and SAA6D107E-1 diesel engine adopt electronically controlled common rail fuel injection system and the design of optimal divergence characteristics at low temperature startup, which improves startup performance and reduces white smoke emission. 

 (6) The turbocharger used on the 125E-2 diesel engine is improved, so that the air supply cycle part can control the impact at the end of the compressor, so that the performance is optimal, the speed range from low speed to high speed is wider, and the fuel consumption is lower .

  (7) The thickness of the top surface of the cylinder block is increased, which can prevent deformation after long-term operation and make remanufacturing easier. In addition, by increasing the rigidity of the main reinforcement, the rigidity of the main body is improved, the deformation and vibration under load are reduced, and the generation of various noises is prevented. 

 (8) The size of the fuel supply pump of the electronically controlled common rail fuel injection system is 1/3 of the fuel supply pump of the ordinary in-line fuel injection system. In addition, the flange is used instead of the mounting seat, and it is tightly connected with the timing gearbox, thereby reducing noise.

  (9) The air filter is changed from ordinary end face seal to radial seal to prevent dust from entering and damaging parts. Additionally, a 5-segment display-type air filter clogging sensor provides accurate information on cleaning times.  

(10) The oil filter is a filter that combines high performance and high efficiency.

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(11) The fuel filter is a special fuel filter with high performance and high efficiency, which can filter out small particles of dirt and protect the electronically controlled common rail fuel injection system. 

 (12) If the electronic control unit judges that the diesel engine is working abnormally, it will issue a warning and the system will switch to the emergency escape mode. 

 (13) After starting the diesel engine at a very low temperature, if the diesel engine speed suddenly increases, the overload will apply excessive load to the bearing before the lubrication is sufficient, which will reduce the service life of the diesel engine, especially the overload will damage Non-locating bearings for turbochargers. In order to prevent this situation, a turbo protection system is installed to limit the diesel engine speed.

Introduction of Hitachi ZAXIS70/70LC Excavator Engine Control System

 
Introduction of  Hitachi ZAXIS70/70LC Excavator Engine Control System

A microcomputer built into the main controller (MC) monitors and controls all machine operations. The MC receives signals from the engine control knob and various other sensor switches. The MC then processes these signals and issues control signals to start the EC motor and various solenoid valves. The microcomputer control operation is as follows.
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1. Engine Control
The engine control system includes by combination: engine control knob control, E mode control, automatic idle speed control; optional ML (crane mode) engine speed limit control and engine learning control. The layout of the engine control system is shown in Figure 2-1.

2. Engine control knob control
Engine control knob control function: Control the engine speed according to the rotation angle of the engine control knob and reduce the engine speed by 100r/min when all joysticks are in the neutral position to reduce fuel consumption and noise. Operation: MC drives the governor lever according to the turning angle of the engine control knob to adjust the engine speed.
TIP: Even when the control knob is turned to the full speed position, the governor lever does not make contact with the full speed stop. With all joysticks in neutral (travel and nose attachment/swing sensors off)
After about 1 second, MC drives the EC engine to reduce the engine speed by 100r/min from the maximum speed.
The engine speed drops 100r/min from the maximum speed. Therefore, when the engine speed set by the engine control knob is already lower than the maximum speed of 100r/min, the engine speed remains unchanged. This engine speed deceleration control works regardless of whether the automatic idle speed control works. High and low idle speed control ranges are shown in Figure 2-2. The engine control knob controls are shown in Figure 2-3.

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The angle of rotation decreases proportionally.
The E-mode control diagram is shown in Figure 2-5.

4. Automatic idle speed control
engine control
knob position
Automatic idle speed control function: when all joysticks are in the neutral position
, reduce engine speed to reduce fuel consumption and noise levels.
Figure 2-4 Engine speed drops at a constant specified rate
Automatic idle speed control operation: about 3.5s after all joysticks return to the neutral position, MC drives the EC motor, as shown in Figure 2-6, to reduce the engine speed to the automatic idle speed. As long as the joystick is operated (travel and/or front attachment, swing pressure sensor on) the MC drives the EC motor to increase the engine speed to the original engine speed (set by the engine control knob). Conditions under which the automatic idle system does not work:
1) Joystick: When operating (travel, swing, or front attachment joystick when the pilot sensor is on).
2) Power mode switch: when E mode is converted into P mode or P mode is converted into E mode.
3) Engine Control Knob: When changing the engine speed.
The automatic idle speed control is shown in Figure 2-7.

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5. Idle acceleration control
Idling Acceleration Control Function: When the engine is running at a low speed, it prevents the engine from vibrating irregularly.
Idle speed acceleration control operation: as shown in Figure 2-8, when the engine is running at a speed between low idle speed and idle speed acceleration, when the travel or front-end accessory function is operated, MC drives the EC motor to make the engine speed idle speed acceleration control as shown in Figure 2 -9 shown.

6. Engine Learning Control
Engine Learn Function: Enter Governor Lever Stop in STOP
and FULL (full speed) side position as standard data to control the engine.
Engine learning operation: As shown in Figure 2-10, when the learning switch in the rear console is turned to the engine learning position, the EC motor is driven sequentially by signals from idle speed to full speed and to stop position. The EC sensor detects the position of the stoppers of the speed control lever on the FULL (full speed) and STOP (stop) sides and sends the stopper position signals to the MC, which stores these signals in its memory. Engine learning control is shown in Figure 2-11.
TIP: If repair work is done, be sure to perform an engine study. After performing the engine learning, use Dr.EX to check whether the engine learning has been carried out correctly.
When the battery is replaced, engine learning is not required.

7. Valve control
1. Travel motor swash plate angle control
Valve control function: select the walking speed in fast or slow mode.
2. Valve control operation
Slow mode: When the travel mode switch is in the SLOW (slow) position, MC will close the travel mode solenoid valve. The travel mode solenoid valve blocks the travel motor swash plate angle control oil pressure. Therefore, the travel motor swash plate angle increases, reducing the travel motor speed.
Fast mode: When the travel motor switch is set to the FAST (fast) position, MC will open the travel mode solenoid valve. The travel mode solenoid valve provides swash plate angle control oil pressure to the travel motor. Therefore, the angle of the travel motor swash plate is reduced, and the speed of the travel motor is increased.

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8. Walking alarm control
Walking alarm control works only when optional parts are installed. Walking alarm control function: the buzzer sounds when walking.
Walking alarm control operation: When performing a walking operation, the pressure sensor (walking) sends a signal to the MC. As soon as this signal is sent out, the MC outputs a signal to the walking alarm device to sound the buzzer.
Tips: After continuous walking for 13s or more, operating the buzzer release switch will disable the buzzer.
Walking alarm control is shown in Figure 2-13.
9. Slewing alarm control
The slewing alarm control works only when the option is installed.
Slewing alarm control function: During the slewing operation, the buzzer will sound while the indicator light is turning.
Swing alarm control operation: When performing a swing operation, the pressure sensor (swing) sends a signal to the MC. As soon as this signal is sent out, the MC outputs a signal to the slewing alarm device, sounds the buzzer and rotates the indicator light.
Note: Operating the buzzer release switch will disable the buzzer.
The rotation alarm control is shown in Figure 2-14.

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INPUT SHAFT DISASSEMBLY (FRONT
SUPPORT END)
IMPORTANT: When using a bearing puller be very
careful to ensure it does not touch the tip of the gear
teeth as they may become chipped or broken.

1.  Support the shaft vertically (rear support end) in
a soft jawed vice and remove the sealing ring. At￾tach a 3 legged puller (1), to the underside of the
forward primary gear (2) and remove the gear
hub, needle bearings and spacer, thrust washer,
and bearing from the shaft.

NOTE: Prior to removal of the snap ring the wear fac￾tor of the clutch plates should can be checked.
Measure the distance between the face of the top
plate to to underside of retainer, approx. dimensions:
When new Approx. 2.22--4.93mm (0.08--0.19in)
When run in Approx. 5.64--8.35mm (0.22--0.32in)
Anything exceeding or close to 8.35mm should be
considered as worn and replaced with new.

2.  Release the snap ring (1), retaining the clutch
pack drive rings and remove from the clutch
housing.
The discs must be flat and not discoloured in any
way, if in doubt renew the discs.

3.  Using a press and tool NH 21 102 (1), compress
the clutch piston spring (2) to enable release of
the circlip (3). Carefully release the press pres￾sure on the spring. Remove the circlip, washer
and spring.

42 SECTION 21 -- TRANSMISSIONS -- CHAPTER 1
05/2003

4.  To remove the piston blank off the oil feed holes
that are not required and carefully apply air pressure to the forward clutch oil feed hole (1) in the
middle ring sufficiently to push the piston out
against seal resistance.

5.  The piston seals should be removed and discarded prior to re--assembly.
Inspect all parts for scoring wear marks and or discolouration, replace suspect parts as necessary.

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NOTE: The grove depth on the friction disc when
new is 0.38mm (0.014in) and is acceptable down to
0.10mm (0.004in). However any depth close to or
below 0.10mm (0.004in) when a teardown has taken
place should be considered as worn and replaced
with new.


INPUT SHAFT RE--ASSEMBLY (FRONT
SUPPORT END)
With the shaft supported vertically (in a soft jawed
vice), re--assembly is in reverse order of disassembly, ensure all metallic parts are liberally coated in
clean transmission oil before fitting.

6.  The internal and external piston seals require replacing, before assembly, soak seals in luke
warm water prior to fitting. Carefully refit the inner
‘O’-- ring and then the gland seal. The outer ‘O’--
ring can now be fitted along with the outer gland
seal.

7. Lubricate the piston seal and carefully place the
piston back into the clutch housing until fully
seated. Re--assemble the piston spring, washer
and compress using tool no #380000679 suffi￾ciently to allow refitting of the circlip and place the
thrust washer in position.

IMPORTANT: Soak new clutch friction discs in clean
new oil for a minimum of 3 hours

8. Continue to refit the clutch discs (6 thin steel with
1 thick retaining plate) and (6 friction plates) back
into the hub, steel first, followed by friction and
then repeat steel, friction. The final steel plate to
be fitted is the thicker retaining plate that the
snap ring seats onto. Refit the snap ring into the
groove of the clutch hub.

9. Once the gear is assembled into the clutch plates
the needle bearings and spacer can be as￾sembled into the bore of the gear without remov￾ing it from the clutch drum.

 

10. Place the thrust bearing (1) on the gear face with
the thrust washer and refit the bearing using a
press and tool #380000712 (2).
 

 SECTION 21 -- TRANSMISSIONS -- CHAPTER 1
05/2003
11. With the bearing (1) fully seated ensure a free￾play of at least 0.0508--0.40mm (0.002--0.016in)
exists between the thrust washer and gear (2).

12. Fit a new sealing ring onto the shaft above the
bearing (1).
INPUT SHAFT DISASSEMBLY
(REAR SUPPORT END)

13. Support the shaft vertically (front support end) in
a soft jawed vice and remove the sealing rings
(1). Attach puller (2) to the underside of the bear￾ing (3) and remove. Remove the circlip which al￾lows the removal of the thrust washer, thrust
bearing, gear/hub, needle bearings with spacer.

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14. Release the snap ring (1) retaining the clutch

pack drive discs and remove from the clutch
housing.
SECTION 21 -- TRANSMISSIONS -- CHAPTER 1

15. Using a press and tool # 380000679 compress
the clutch piston spring to enable release of the
circlip. Carefully release the press pressure on
the spring. Remove the circlip, washer and
spring