25
Instruction Manual
Excessive Delivery
• Low discharge line pressure. Increase line pressure
(e.g., install a back pressure valve).
Motor and pump
body hot
• Normal operating temperature of both motor and pump body is frequently
uncomfortable to the touch. However, neither should exceed 200°F (93°C).
• Power supply does not match electrical requirement of motor. Insure proper
matching of power supply and motor.
• Pump is being operated at greater than rated performance. Reduce pressure or
stroke speed. If this is not practical, contact service facility.
• Pump improperly lubricated. Drain oil and refill with proper amount of
recommended lubricant.
Pump still pumps
even at zero
capacity setting
• Misadjusted micrometer knob. Readjust capacity setting.
• Insufficient discharge pressure. Correct condition
(e.g., install a back pressure valve).
Gear noise.
• Excessive backlash. Consult service facility.
• Worn bearings. Consult service facility.
• Wrong or insufficient lubricant. Replace or replenish lubricant.
Loud knock with
each stroke
• Excessive gear set wear. Consult service facility.
• Worn bearings. Consult service facility.
• Incorrect motor rotation. Should be clockwise as viewed from top of motor.
• Worm shaft spring (360) missing.
Noisy operation in
liquid end
• Noise in check valves. Ball checks move up and down with some force.
A distinct “clicking” noise is normal, especially in metal piping systems.
SECTION 5 - TROUBLESHOOTING
