PRS-33
Power Lift
Repair Stand
Carriage assembly makes no noise
and will not go up or down
• Power supply not plugged into electrical outlet
• Power cord not plugged into power supply
• Power supply not plugged into power terminal on
carriage assembly
• Directional switch on carriage assembly is in the
neutral position
• Terminals in the motor enclosure are not secure
• Power supply has malfunctioned
• Plug power supply into electrical outlet
• Plug power cord into power supply
• Plug power supply into power terminal on carriage
assembly
• Push directional switch to the up or down position
• Push terminals together
• Replace power supply
Motor runs but carriage assembly
does not go up and/or down
• Carriage is pressing against a limit or obstruction
• Carriage has moved up or down beyond its
usable range
• Gears and cogs in carriage assembly are not
moving freely
• Quick release and brake block on carriage assembly
is secured
• Poor connection between coupling connecting motor
to driveshaft
• Reverse direction of carriage assembly and remove
obstruction
• Reverse direction of carriage assembly
• Remove obstruction in gears or cogs in carriage
assembly
• Loosen quick release lever to release brake block
• Tighten set screws in coupling
Chain slaps against upright
Chain is too loose
Adjust chain tensioning assembly to tighten chain
Carriage assembly is slow to
change directions
Chain is too loose
Adjust chain tensioning assembly to tighten chain
Carriage assembly "drops" slightly
when traveling down
Chain is too loose
Adjust chain tensioning assembly to tighten chain
Carriage assembly vibrates slightly
when traveling up or down
Bearing wear
Adjust the three set screws on the carraige assembly
(tray side)
Motor in carriage assembly is slow
and sounds labored
Chain is too tight
Adjust chain tensioning assembly to loosen chain
Ticking noise from under cover on
carriage assembly
Chain is too tight
Adjust chain tensioning assembly to loosen chain
Work tray is loose
Bolts under work tray are loose
Tighten four bolts under work tray
Upright leans when stand is in use
• Fasteners connecting upright, upright supports and
base not tight
• Base is not level
• Tighten fasteners connecting upright, upright supports
and base
• Adjust base leveling set screws
TROUBLESHOOTING
SYMPTOM
CORRECTIVE ACTION
POSSIBLE CAUSES
IMPORTANT NOTES:
ALWAYS UNPLUG PRS-33 FROM ELECTRICAL OUTLET BEFORE ANY ADJUSTMENT, MAINTENANCE OR
REPAIR TASKS ARE PERFORMED. NEVER OPERATE THE PRS-33 WITHOUT THE COVER INSTALLED ON THE
CARRIAGE ASSEMBLY.
US
