Komatsu Galeo PC850-8 User Manual

10 PC800, 850-8
SEN00791-02 40 Troubleshooting
Failure code [CA559] Rail Press Low Error
<How to use check sheet>
Carry out the above troubleshooting and take a record of the contents of the attached “Check sheet for no-pres-
sure feed”.
Action code Failure code
Trouble
Rail Press Low Error
(Engine controller system)
E15 CA559
Contents of
trouble
• There is rail press very low error (level 1).
Action of
controller
• Limits common rail pressure.
Problem that
appears on
machine
• Engine output lowers.
Related
information
Possible causes
and standard
value in normal
state
Cause Standard value in normal state/Remarks on troubleshooting
1 Defect in related system If another failure code is displayed, carry out troubleshooting for it.
2 Use of improper fuel Fuel used may be improper. Check it directly.
3
Defect in low pressure cir-
cuit parts
aFor more information on troubleshooting, see Note 1. For check of
pressure in fuel low pressure circuit, see Testing and adjusting,
Checking fuel pressure.
Pressure in fuel low-pressure
circuit
Min. 0.15 MPa
{Min. 1.5 kg/cm
2
}
4 Clogged fuel filter, strainer aFor more information on troubleshooting, see Note 2.
5
Defective electrical system
of supply pump PCV
Electrical system of supply pump PCV may be defective. Carry out trou-
bleshooting for failure code [CA271], [CA272], [CA273], or [CA274].
6
Defective common rail
pressure sensor
Mechanical system of common rail pressure sensor may be defective.
Check whether wiring harness is damaged.
7 Defective pressure limiter
aFor check of leakage through pressure limiter, see Testing and adjust-
ing, Checking fuel return rate and leakage.
Leakage through pressure limiter
Max. 10 cc/min
During rated output (pump relief)
operation
8 Defective injector
aFor check of limit return rate (spill) from injector, see Testing and
adjusting, Checking fuel return rate and leakage.
Speed in rated operation
Limited return (spill) rate from injec-
tor
1,600 rpm 960 cc/min
1,700 rpm 1,020 cc/min
1,800 rpm 1,080 cc/min
1,900 rpm 1,140 cc/min
2,000 rpm 1,200 cc/min
9 Defective supply pump If causes 1 – 8 are not detected, supply pump may be defective.

Komatsu Galeo PC850-8 Specifications

General

Brand	Komatsu
Model	Galeo PC850-8
Category	Excavators
Language	English