Sakai SV540 Series, Shop Manual

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9-039
TROUBLESHOOTING
2-5. Propulsion
Check following items before troubleshooting.
No blown fuses and power is applied up to fuses.
when measuring voltage and current without disconnecting connectors, refer to “Measuring voltage and current
flowing using tester” (P.9-006 to P.9-008).
Check any ground circuit which belongs to components to be checked.
2-5-1. Machine moves neither forward nor backward
Parking brake switch must be released.
Foot brake switch must be ON (Brake pedal is not depressed).
Reference Fig.: 2-5-1
Check point Check/Cause Action
1. Parking Brake Solenoid Disconnect harness and measure resistance of coil.
Standard resistance : 45
± 4.5
Ω
If measured resistance is abnormal, parking brake
solenoid is faulty.
•
•
Replace parking brake
solenoid.
2. Foot Brake Switch (1) when starter switch is ON, measure voltage between
foot brake switch terminal COM inlet wire R and chassis
ground.
Standard voltage : 24 V or more
(2) when starter switch is ON, measure voltage between
foot brake switch terminal NO outlet wire LgR and
chassis ground.
Standard voltage : 24 V or more
If above item (1) is OK and item (2) is NG, foot brake
switch is faulty.
•
Replace foot brake
switch.
3. Parking Brake Switch (1) when starter switch is ON, measure voltage between
parking brake switch terminal 1 inlet wire LgR and
chassis ground.
Standard voltage : 24 V or more
(2) when starter switch is ON, measure voltage between
parking brake switch terminal 3 outlet wire BrW and
chassis ground.
Standard voltage : 24 V or more
If above item (1) is OK and item (2) is NG, parking brake
switch is faulty.
•
Replace parking brake
switch.
4. Harness Connecting
Between Terminals
Measure resistance of harness connecting between
terminals.
Standard resistance : 10 Ω or less
If resistance is abnormal, harness is faulty.
•
•
Repair or replace
harness.
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•
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