OPERATOR'S MANUAL
Table Of Contents
- OPS - Excavator U48-4 (RD45881312)
- Abbreviation List
- General Symbols
- Foreword
- Safety First
- Contents Page
- Safe Operation
- Dealer Service
- Technical Data
- Description of Machine Parts
- Instrument Panel and Control Elements
- Checks Before Start
- Daily Checks
- Checking the Devices
- Starter Switch
- Display Selector Switch
- LCD Display for Normal Operation
- Warning Lamp
- LCD Display for Warning
- Setting the Clock
- Reordering the year/month/day and Changing the AM/PM System to the 24 hour one
- Log Record
- Periodic Check
- If all the Check Points are not Displayed at a Glance on a Single Screen
- When the Checkup is Completed
- Horn Switch
- Working Light Switch
- AUX Port Flow Rate Limit Switch
- Auto Idle Switch
- Throttle Potentiometer
- Travel Speed Switch
- CAB Type Machines
- Air Conditioner
- Handling the Safety Devices
- Operation of the Engine
- Excavator Operation
- Running-In of the New Excavator
- Starting
- Driving
- Turns
- Up and Downhill Driving
- Parking on a Slope
- Operation of the Dozer
- Two Pattern Selection System (TPSS)
- Operation of the Boom
- Operation of the Arm
- Operation of the Bucket
- Unit Swing and Boom Swing Operation
- Auxiliary Port Operation
- How to Release Pressure Trapped in the Hydraulic System
- 1 Way or 2 Way Circuit Selection Valve Operation
- Auto Idle (AI) Operation
- Important Information on Excavator Operation
- Transporting the Excavator on a Vehicle
- Lifting of the Excavator
- Maintenance
- Maintenance Intervals
- Opening and Closing of Covers
- Daily Checks
- Checking Coolant Level
- Checking Fuel Level
- Checking Engine Oil Level
- Checking Hydraulic Oil Level
- Checking V-Belt
- Checking Radiator and Oil Cooler
- Checking Washer Liquid
- Cleaning Pre-Cleaner
- Checking and Cleaning Engine and Electrical Wiring
- Greasing Boom Swing Fulcrum
- Washing Whole Machine
- Greasing Front Attachments (without Bucket Pin and Boom Swing Fulcrum)
- Greasing Bucket Pin and Bucket Link Pin
- Regular Checks and Maintenance Work
- Other Adjustments and Replacements
- Troubleshooting
- Operation Under Cold Weather Conditions
- Long Storage
- Recommended Oils
- Appendices
- Lifting Capacity
- List of Screens
84 TROUBLESHOOTING
TROUBLESHOOTING
If the excavator does not show the desired performance, or when trouble arises, refer to the table below and undertake
appropriate measures.
Trouble Cause Countermeasure
Engine
Starting
difficulties
Lock levers in "UNLOCK"
position
* Bring lock lever into "LOCK" position.
Fuel is too viscous.
* Check fuel tank and filter.
* Remove impurities and water.
* If necessary, replace filter.
Air or water in the fuel
system
* Remove water from the fuel tank.
* Check fuel pipe joint bolts and nuts for looseness.
* Purging of the fuel system (for fuel filter and injection pump,
see "PURGING OF THE FUEL SYSTEM" in the chapter.
"OTHER ADJUSTMENTS AND REPLACEMENTS".)
Oil viscosity is too high the
engine runs sluggishly in
winter.
* Pour hot water over the radiator.
Battery is almost dead;
insufficient compression.
* Recharge battery.
Insufficient
engine power
Low fuel level * Check fuel and add if necessary.
Clogged air cleaner * Clean the air filter element.
Engine suddenly
stops.
Low fuel level
* Check fuel and add if necessary.
* Purge the fuel system.
Abnormal
exhaust gas
color
Poor fuel * Use high quality fuel.
Too much engine oil * Drain engine oil to prescribed oil level.
Water
temperature
in red zone
(Overheating)
Defective seal of the water
pump
* Replace.
Worn or torn V-belt * Adjust or replace.
Thermostat is defect. * Replace.
Coolant level too low * Fill to prescribed level.
Radiator grill or fins are
clogged.
* Clean.
Coolant is contaminated
with rust from the cylinder
head or crank case.
* Replace coolant fluid and add anti-rust.
Defective radiator cap
(Evaporation)
* Replace.
Corroded coolant pipes * Clean.
Continuous operation
under full load
* Reduce load.