Product Manual

46 Owner’s Manual for Dry-Prime Diesel Trash Pumps

Maintenance

Top-Wind Models

•

Apply a lightweight oil to the screw stem.

Figure 4-1. Lubrication Points

Wear Rings

Wear rings are vital for successful pump operation. They

reduce the pressure at the stuffing box and they reduce

axial thrust loads. Wear rings should be replaced if the

clearance has increased to about 0.03 in (0.76 mm) per

side.

Servicing The Pump

Pump Disassembly

1. Remove all capscrews from the volute. Insert two

of the capscrews into the tapped holes in the back-

plate. Do not allow the volute to fall onto the impel-

ler.

2. See Figure 4-2 and Figure 4-3. Remove the

impeller lockscrew with a breaker bar. Do not use

an impact wrench. Apply steady and even torque to

break lockscrew loose. Allen head tooling to

remove the lockscrew should be in excellent

condition. Discard the lockscrew. Remove the

impeller washer.

3. Remove any flush lines to the seal gland.

4. Remove the gland capscrews evenly until

capscrews are free of the backplate.

5. Space wedges in pairs 180° apart between the

impeller and backplate. Verify the wedges are

placed along impeller vanes. Tap opposed wedges

at the same time to force off the impeller. Use

extreme care to avoid damage to impeller, shaft

and bearings.

6. Remove the impeller and impeller key.

7. Unbolt and remove the backplate from the bracket.

8. Remove the mechanical seal.

9. The suction wear ring can be removed by drilling

the ring longitudinally in three places to relieve

compression and collapsing the three sections

together. Use care not to drill into the volute

casting. Better control is obtained if small pilot

holes are first drilled and then enlarged to “cut” the

ring. This same technique can be used to remove

the hub wear ring.

002755

A = Oil B = Grease