Skyjack SJKB-40-D Operating Maintenance Instructions & Part List page 69

TROUBLE
UNIT WILL NOT DRIVE
(Cont.)
NOTE: Platform must be
over non steering axle for
these tests.
NO DRIVE REVERSE
NO DRIVE FORWARD
SECTION 4, Page 18
TROUBLESHOOTING (Cont.)
PROBABLE CAUSE
ELECTRICAL SYSTEM (Cont.)
31. Loose or broken wire #98 from
base terminal block TB3 to
tachometer pickup TP1.
32. Defective tachometer pickup TP1.
33. Loose or broken wire #98A from
tachometer pickup TP1 to base
terminal block TB3.
34. Loose or broken wire #98A from
base terminal block TB3 to terminal
#9 on EDA board EDA1.
35. Defective EDA board EDA1.
36. Loose or broken wire #09 from EDA
board EDA1 to MDSD board
MDSD1.
37. Loose or broken wire #02 from EDA
board EDA1 to MDSD board
MDSD1.
38. Blown MDSD board fuse F3.
39. Defective MDSD board MDSD1.
1. Loose or broken wire #15 from
terminal #5 on MDSD board
MDSD1 to base terminal block
TB3.
2. Loose or broken wire #15 from
base terminal block TB3 to drive
reverse valve coil 4H-15.
3. Defective drive reverse valve coil
4H-15.
4. Loose or broken wire #02 from
drive reverse valve coil 4H-15 to
the drive pump case.
5. Defective MDSD board MDSD1.
1. Loose or broken wire #16 from
terminal #3 on MDSD board
MDSD1 to base terminal block
TB3.
2. Loose or broken wire #16 from
base terminal block TB3 to drive
forward valve coil 4H-16.
3. Defective drive forward valve coil
4H-16.
4. Loose or broken wire #02 from
drive forward valve coil 4H-16 to
the drive pump case.
5. Defective MDSD board MDSD1.
JUN. 1999
REMEDY
31. Check Continuity. Replace if
defective.
32. Refer to section 5, tachometer
pickup testing procedure.
33. Check Continuity. Replace if
defective.
34. Check Continuity. Replace if
defective.
35. Refer to section 5, EDA board
troubleshooting.
36. Check Continuity. Replace if
defective.
37. Check Continuity. Replace if
defective.
38. Replace fuse. Check for shorted
wiring.
39. Refer to section 5, MDSD board
troubleshooting.
1. Check Continuity. Replace if
defective.
2. Check Continuity. Replace if
defective.
3. Check Continuity through coil.
Replace if defective.
4. Check Continuity. Replace if
defective.
5. Refer to section 5, MDSD board
troubleshooting.
1. Check Continuity. Replace if
defective.
2. Check Continuity. Replace if
defective.
3. Check Continuity through coil.
Replace if defective.
4. Check Continuity. Replace if
defective.
5. Refer to section 5, MDSD board
troubleshooting.
SJKB-40-D, SJKB-40-D/F