Table of Contents
Advertisement
H-17 In combined operation of work equipment , equipment having
heavier load moves slower
In combined operation of work equipment, equipment having heavier load moves slower.
Failure
Related
information
No.
Cause
Malfunction of control
valve on smaller load
side (pressure
1
compensation valve)
(arm IN)
Malfunction of control
valve on smaller load
side (pressure
2
compensation valve)
(boom RAISE)
Malfunction of control
valve on smaller load
side (pressure
3
compensation valve)
(bucket CURL)
Malfunction of control
valve on smaller load
side (pressure
4
compensation valve)
(boom LOWER)
a Pressure compensation valve is equipped with outer seal, inner seal, and LS check valve (ball).
Since slipper seal is installed to inner seal, damage on O-ring inside inner seal cannot be checked visually.
PC88MR-10
Troubleshooting of hydraulic and mechanical system (H-
(PC88MR-D34-400-A-Z0-A)
Procedure, measuring location, criteria, and remarks
Operations
combined
Boom RAISE and
arm IN
Pressure compensation valve of control valve on smaller load side may
malfunction.
Operations
combined
Boom RAISE and
arm OUT
Pressure compensation valve of control valve on smaller load side may
malfunction.
Operations
combined
Boom RAISE and
bucket CURL
Pressure compensation valve of control valve on smaller load side may
malfunction.
Operations
combined
Arm OUT and bucket
CURL
Pressure compensation valve of control valve on smaller load side may
malfunction.
Operations
combined
Boom LOWER and
arm OUT
Pressure compensation valve of control valve on smaller load side may
malfunction.
40 Troubleshooting
Heavier load side
Boom RAISE
Heavier load side
Arm OUT
Heavier load side
Boom RAISE
Heavier load side
Arm OUT
Heavier load side
Arm OUT
mode)
Smaller load side
Arm IN
Smaller load side
Boom RAISE
Smaller load side
Bucket CURL
Smaller load side
Bucket CURL
Smaller load side
Boom LOWER
40-489
Advertisement
Chapters
Table of Contents
Troubleshooting
