Mec 2033ES - Page 63

"2033ES / 2633ES" Service & Parts Manual - ANSI Specifications October 2008
Page 4-9
PROBLEM REMEDY/SOLUTION
No Drive in
REVERSE only
Pump motor
NOT operating
while
attempting to
drive
Troubleshooting (continued
POSSIBLE CAUSE
DRIVE (CONTINUED)
Micro-switch S7 inoperative Check operation of micro-switch
Located in upper control box on joystick
Mode Selector Switch S6 faulty Check power through S6 on wire 10
Damaged wiring or poor plug
connection
Check wire 10 through plug connections from upper
control box to Diode Board
Failed diode in diode board Test diodes on diode board
Replace diode board
No Drive in
FORWARD only
Pump motor
NOT operating
while
attempting to
drive
Micro-switch S8 inoperative Check operation of micro-switch
Located in upper control box on joystick
Mode Selector Switch S6 faulty Check power through S6 on wire 11
Damaged wiring or poor plug
connection
Check wire 11 through plug connections from upper
control box to Diode Board
Failed diode in diode board Test diodes on diode board
Replace diode board
No Drive in
REVERSE only
Pump motor
OPERATES
while
attempting to
drive
Drive valve SV3 not shifting Check power to SV3, remove SV3
Check for contaminations
Replace SV3
No Drive in
FORWARD only
Pump motor
OPERATES
while
attempting to
drive
Drive valve SV3 not shifting Check power to SV3, remove SV3
Check for contaminations
Replace SV3
Drives in one
direction
regardless of
direction
operated
Drive valve SV3 sticking Check SV3 for contaminations
Replace SV3
Drive valve SV3 powered in one
direction
Short in wiring, faulty diode board.