Speed Or Power Of Bucket Is Low - Komatsu PC130-8 Shop Manual

SEN04124-00
H-8 Speed or power of bucket is low
Trouble

• Speed or power of bucket is low.

Related
• Conduct the troubleshooting in working mode P.
information
Malfunction of right PPC
1
valve (bucket circuit)
Malfunction of pump merge-
2
divider solenoid valve
Possible causes
Malfunction of pump merge-
and standard
3
divider valve
value in normal
state
Malfunction of bucket control
4
valve (spool)
Malfunction of bucket control
5 valve (pressure compensa-
tion valve)
Malfunction or defective
6 sealing of bucket control
valve (safety-suction valves)
Malfunction or defective
7 sealing of centralized safety-
suction valve
8 Bucket cylinder defective
12
Cause
a
Right work equipment control
a
The pump merge-divider valve of the control valve may have a
malfunction. Check it directly.
The spool of the bucket control valve may have a malfunction.
Check it directly.
The pressure compensation valve of the bucket control valve may
have a malfunction. Check it directly.
The safety-suction valves of the bucket control valve (on the bot-
tom side and head side) may have a malfunction or their sealing
may be defective. Check them directly.
The centralized safety-suction valve of the control valve may have
a malfunction or its sealing may be defective. Check it directly.
a
Relieved in CURL direction
Standard value in normal state/Remarks on troubleshooting
Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
lever
NEUTRAL
Bucket CURL position
Bucket DUMP position
Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Control levers
All levers in NEUTRAL
Position for travel only
(On either or both sides)
Keep the engine stopped for the preparations, and keep it
running at high idle during the troubleshooting.
Bucket cylinder
40 Troubleshooting
PPC valve output pressure
0 MPa {0 kg/cm }
2
Above 2.7 MPa
{Above 28 kg/cm }
2
Solenoid output pressure
0 MPa {0 kg/cm }
2
2.84 – 3.43 MPa
{29 – 35 kg/cm }
2
Leakage from cylinder
15 cc/min
PC130-8
1