Belt/Pulley Drive Installation
Belt and pulley drive systems are typically used to reduce pump speed. For determining proper pulley sizes, use the
formula below as a guideline and use “A” or “B” section belts.
1. Install pulley or bushing/sheave combination onto pump and motor shaft. Mount pump next to the motor making
sure pulleys are lined up properly. (See Figure 3 for proper pump and motor orientation.) Use a straight edge as
shown (Figure 4). Rotate to check for run-out and bent shafts and replace if found.
2. Make sure belts have proper tension - belts too tight will cause bearing wear and belts too loose will cause
slipping (See Figure 5).
Direct Drive-Flexible Coupling
When direct driving Hypro roller pumps with flexible couplings, make sure that the speed (rpm) of the gas engine or
electric motor is within the maximum rated rpm of your pump (see performance tables). Also make sure that shaft
rotation is correct between the pump and the motor or gas engine (see Figure 6).
1. Mount motor or engine into position on base.
2. Line up pump shaft with straight edge as shown in Figure 6 to assure they are aligned. Shim pump, if
necessary, to match shaft height of engine or motor. Shaft ends should not touch.
3. Mark exact position of pump on base - remove and install coupling halves on both shafts. Place coupling center
disc into one of the coupling halves.
4. Reposition pump, sliding coupling halves together.
ATTENTION: No end thrust should be applied to pump when coupling is connected.
5. Tighten pump mounting; then tighten the set screws on each coupling.
- 21 -
Assembly and Installation - cont’d.
Push the belt midway between the pulleys,
check the deflection (d) and adjust:
d = 0.016 x L
MOTOR RPM FLOW (@ RATED SPEED) PUMP PULLEY DIA.
PUMP RPM FLOW (DESIRED) MOTOR PULLEY DIA.
Example:
Use a 1725 RPM electric motor to drive a pump at 950 RPM.
Typically, a pulley diameter on the motor is 3.4 inches. The pump pulley diameter can be determined from the formula
above:
1725 RPM Pump Pulley Diameter
950 RPM 3.4 inches
Solving this equation for the Pump Pulley diameter yields:
1725 RPM
950 RPM
(1 inch = 2.54cm)
=
=
=
Figure 3
Figure 4
Figure 5
x 3.4 inches = 6.2 inches
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