Mitsubishi Heavy Industries BS3G Service Manual

TESTING AND ADJUSTMENT
(
TROUBLESHOOTING GUIDE
HYDRAULIC SYSTEM
Complaint
Possible cause
Remedy
I. Pump noisy, cylinder
(I) Air in hydraulic system
•
Prime.
action jerky and
(2) Air leaks at pump inlet
•
Prime.
abnormal oil foaming
(3) Pump parts worn
•
Replace.
(4)
Oil viscosity too heavy
•
Change·oil.
2. Oil temperature too
(1) Oil viscosity too heavy
•
Change oil.
high
(2) Tendency
to overloading
•
Reduce load.
"
."
(3) Pump parts worn
•
Replace.
3.
Pump,not delivering
(I) Oil level low in tank
•
Add.
enough oil
(2)
Oil viscosity too heavy
•
Change oil.
(3) Pump speed low
•
Disassemble and inspect.
(4) Pump performance low
,
•
Disassemble and inspect.
4. Cylinder motion slow
(I) Pump not delivering enough oil
because of:
(a) Worn pump
parts,
•
Replace.
(b) Improperly assembled
pump
•
Reassemble.
(2) Cylinder piston seals defective
•
Replace.
(3)
O·ring seals in circuits defective
•
Replace.
5. Cylinder motion erratic
(1) Piston seal rings worn
•
Replace.
(2) Control
valve plungers worn
•
Replace.
(3) Makeup
valve or safety valve nol
•
Repair or replace.
seating properly
(4) Main relief
valve maladjusted or
•
Disassemble and inspect.
inoperative
(5) O·rings in circuits defective
•
Replace.
32

Mitsubishi Heavy Industries BS3G Specifications

General

Brand	Mitsubishi Heavy Industries
Model	BS3G
Category	Engine
Language	English