Watson-Marlow 501CC - Manual (Page 5)

5
Start up
Before starting and after prolonged storage of the gear units, remove the plug from the vent screw on top of the casing to avoid
excessive pressure in the gearbox, which may cause leakage at the shaft seals.
Troubleshooting
Should the pump fail to operate, make the following checks to determine whether or not servicing is required.
• Check the electrical supply is available at the pump.
• Check that the pump is not stalled by incorrect fitting of tubing.
Always check to ensure that an Exd motor gearbox is suitably rated for the hazardous zone area in which it
is to be mounted. Exd motors should only be installed by Exd qualified personnel.
Any deviation from normal operating conditions (increased power consumption, temperature,
vibrations, noise) or warning signals by monitoring equipment suggest malfunction. Inform the
responsible maintenance personnel at once to prevent the trouble from worsening. If in doubt
disconnect the pump immediately.
AC Motor maintenance
• Remove any dust deposits from the fan cover to avoid overheating.
• Ensure that the bearing cage is packed to about 1/3 with evenly distributed lubricating grease.
• Select the correct lubricating grease from the table in the back of this operating instruction.
Gearbox maintenance - Simplex (single pumphead) units
• Change lubricant every 10,000 working hours or after 2 years.
• Combine a lubricant change with a thorough cleaning of the gear unit.
• Extreme working conditions (high air humidity, aggressive media and large temperature variations) will reduce the interval between
lubricant changing intervals.
• Select the correct lubricating oil from the table in the back of this operating instruction.
Gearbox maintenance - Duplex (twin pumphead) units
The gearbox is filled for life with synthetic lubricant so no maintenance is required.
Belt variator maintenance
• Pulleys are supplied with a permanent grease packing. No refill is necessary. The variator should occasionally be run over its full
range to apply a grease coating to the full track.
• The control spindle should be cleaned and greased occasionally.
Replacement of the V-belt
• Unscrew socket head screws and remove cover with the entire speed control mechanism.
• Remove V-belt
• Wrap new V-belt around open adjustable pulley and let it slip over the spring loaded pulley. The V-belt can be easily attached if the
adjustable pulley is opened. Ensure that the adjustable pulley is opened carefully.
• Replace the removed cover with complete speed control mechanism and re-assemble.
• When positioning the top (adjustable pulley closed) speed limiting lock nut, ensure that the adjustable pulley has a gap of 0.5-
1.0mm to prevent damage to the pulley and motor bearings.
• The V-belt should not be in contact with the bottom of the adjustable pulley.
Air Motors
The air motor is designed for air only. Do not allow corrosive, flammable or explosive gases or
particulate material to enter the motor. Water vapour, oil-based contaminants, or other liquids
must be filtered out. The recommended air pressure should not exceed 7 bar, 100 PSIG.
Always disconnect the air supply before servicing.