Sakai SV540 Series, Shop Manual

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9-043
TROUBLESHOOTING
2-5-2. Machine speed cannot be changed 2/5
Engine check lamp must not be lighting. If engine check lamp lights, refer to “Service information” of engine
manufacturer.
Check whether ECO controller red LED shows any blink.
1) when red LED shows no blink.
Reference Fig.: 2-5-1
Check point Check/Cause Action
4. T/C Controller (1) when starter switch is ON, measure voltage between
T/C controller terminal C1-P2 inlet wire G and chassis
ground.
Standard voltage : 24 V or more
(2) when starter switch is ON, measure voltage between
T/C controller terminal C1-P6 inlet wire L and chassis
ground.
Standard voltage : 24 V or more
(3) when starter switch is ON, measure voltage between
T/C controller terminal C1-P7 inlet wire w and chassis
ground.
Standard voltage
: 24 V or more (when F-R lever is “F” or “R”)
: 0 V (when F-R lever is “N”)
(4) when starter switch is ON and F-R lever is “F” or “R”,
measure voltage between T/C controller terminal C1-P7
inlet wire W and chassis ground.
There is no electricity in normal condition.
(5) Check that T/C controller terminal C1-P1 wire B is
grounded.
(6) when starter switch is ON, measure current between
T/C controller and chassis ground.
Front motor side :
T/C controller terminal C2-P3 outlet wire BL and
chassis ground.
Standard current
: 0 mA (when speed change switch is “ ”
and F-R lever is “R”)
: 600 mA (Except when speed change switch is
“ ” and F-R lever is “R”)
Rear motor side :
T/C controller terminal C2-P4 outlet wire Bw and
chassis ground.
Standard current
: 230 mA (when speed change switch is “ ”
and F-R lever is “F”)
: 430 mA (when speed change switch is “ ”
and F-R lever is “N” or “R”)
: 690 mA (when speed change switch is “ ”
and F-R lever is “F” or “R”)
If above items (1), (2), (3), (4) and (5) are OK and item (6)
is NG, T/C controller is faulty.
(NOTICE)
Since current value is output in PWM, standard value
shown above represent maximum instaneous value.
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Replace T/C controller.
5. Repair or replace
harness
Measure resistance of harness connecting between
terminals.
Standard resistance : 10 Ω or less
If resistance is abnormal, harness is faulty.
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Harness connecting
between terminals.
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