Takeuchi TB215R Workshop Manual page 281

PILOT VALVE
"4. Disassembly and assembly, Pilot valve"
Symptoms
The secondary pressure
is too low
The secondary pressure
is unstable
The secondary pressure
is high
PILOT VALVE
Major causes
• Primary pressure is insufficient.
• The spring is broken or worn out.
• The clearance between the spool and
the casing is too large.
• Too much play in the handle.
• The sliding part is not smooth.
• The tank line pressure fluctuates.
• Air is present in the piping.
• Pressure in the tank line is high.
• The sliding part is not smooth.
• Keep the primary pressure.
• Replace
• Replace the spool and the casing assem-
bly.
• Disassemble and assemble or replace.
• Repair or replace.
• Remove the faulty part(s) in the tank line.
• Bleed air by operating the valve several
times.
• Remove the faulty part(s) in the tank line.
• Repair or replace.
1
TROUBLESHOOTING
5
PILOT VALVE
Remedies
5K2AQ00