Takeuchi TB 250 - Page 199

4-94
4
PROPORTIONAL CONTROL SOLENOID VALVE
DISASSEMBLY AND ASSEMBLY
Disassembly
For disassembly of the proportional control solenoid valve,
follow the procedure below. For assembly of the propor-
tional
control solenoid valve, follow the same procedure as
for disassembly in the reverse order.
1. Take out the bolts and remove the proportional control
solenoid valve.
Bolt: 6.9 ±1 N·m
2. Remove the O-ring from the proportional control sole-
noid valve (1).
• Do not disassemble the sleeve (2) that is united with
the solenoid (4) with the retaining ring (3).
• Make sure that the spool (5) moves a little if pushed
from the sleeve (2) end.
4KAD02Z
1
4KAD03Z
2
3
4
5
Inspection and adjustment
Checking the parts
Part Criteria Action
Coil assembly •
When the solenoid is burned, short-circuited, or has a
wire break
• Wiring short-circuit or wire break
• Replace
• Replace
Body •
Scratches, rust, or corrosion at the sliding parts with the
spool
•
Scratches, rust, or corrosion of the seal part in contact
with the O-ring
•
Other damage considered to impair the normal func-
tions
•
Replace
• Replace
• Replace
Spool •
Scratches on the outer circumference that easily catch
a fingernail
• Movement is not smooth
• Replace
• Repair or replace
Spring •
Rust, corrosion, deformation, breakage, or other no-
table damage
•
Replace
O-ring — •
Replace