Table 2-1. Troubleshooting - Continued
TEST OR INSPECTION
CENTRIFUGAL PUMP CONTINUED
Inspect shaft seal for cracks and excessive wear.
Replace a damaged shaft seal.
The seal members are replaceable individually. When replacing the seal, be sure to replace all parts that are provided in the
Reassemble the pump by reversing the disassemble sequence In figure 2-17. Note the following:
Press the seal stationary member (28) into seal plta (29) before installing the plate. Lubricate the impeller shaft lightly with oil
and slide the seal rotating member (25) and spring into place on the shaft.
If the same impeller (20), and wear plate (17) are reassembled and no clearance change is indicated, use shims (22 and 23) of
the same thickness as those removed. If a new impeller and/or wear plate is installed, determine the shim thickness required
to obtain a clearance of 0.010 to 0.020 inch between the impeller and wear plate as follows.
Install impeller (20) on shaft without shims. Be sure that Impeller is seated firmly against the shaft shoulder.
Install volute (18, with wear plate (17) assembled, and secure with screws (12) and lockwasher (13).
Insert a feeler gage into the front opening of the volute and measure from the face of the impeller (20) to the face of the wear
Select shims (22 and 23) to equal the dimensions obtained less 0.010 to 0.020 inch (0.025 to 0.05 cm) clearance.
After reassembly, when using either new or used parts, recheck the clearance; it must be 0.010 to 0.020 inch (0.025 to 0.05 cm).
Check the impeller shaft for free rotation. It must turn freely, without catching or binding. If binding is evident, disassemble the
pump and correct the condition.
Use a hoist or other lifting device and install the pump on the chassis. Install nuts and lockwashers that secure the pump body to
the bearing housing.
Install screws (4, fig. 2-16), lockwashers (3) andnuts (2) that secure pump (1) to the chassis.
If you are installing the same pump you removed, use shims (5, 6, and 7, fig. 2-16) having the same thickness as the ones
removed. If a different pump is being installed, provide shims having proper thickness for sling the bearing housing with the
flywheel housing of the engine.
PUMP MAKES EXCESSIVE NOISE
Check for defective impeller shaft bearings.
Remove drain plug (1, fig.2-18) from the centrifugal pump.