Maintenance 6
Maintenance
Only qualified mechanics with proper tools and
knowledge should attempt to service this pump .
Heavy parts . use lifting gear of appropriate
capacity positioned directly over lift point(s).
Seal Lubrication
oil in the seal chamber should be changed after the first
300 operating hours, then each 1000 hours thereafter or
annually. the oil fill/oil drain opening is labled “oHl”.
after cleaning and sanitizing the pump, drain all oil and
residue into a clean measuring container.
• If the oil is milky in appearance, it is contaminated
with water. refill pump with clean, fresh oil, using
amounts and type shown in Maintenance. check oil
condition again after 300 operating hours.
• If the oil is contaminated with both water and
pollutants, the main seal must be replaced and
the oil changed. recheck oil condition after
300 operating hours.
NOTICE: Whenever the main seal is being serviced,
remove oil and replace with new oil at reassembly. use
only sae 5W-15W (Iso 22-44) mineral oil.
the filling quantity is shown in Product Specifications.
NOTICE: Fill oil reservoir with the exact quantity of oil
specified. the pump will become inoperable if overfilled.
Cutting Rotor
Risk of electrical shock, cuts, and possible
unexpected starts . disconnect the electrical power and
keep your hands away from the pump inlet opening when
working on or handling the pump for any reason. do not
use automatic reset controls with this pump.
1. disconnect the electrical power supply.
2. disconnect the discharge piping (this step is not
necessary if you have a guide-rail lift-out system).
3. Hoist the pump out of the pit using the lift-out
system or the lifting chain (not the cord) and place
the pump in a suitable area where it can be cleaned.
4. remove all scale and deposits from the pump. check
visual appearance of all pump housing screws and
mating surfaces. tighten any loose fasteners.
Risk of infection . pathogens (such
as hepatitis) can collect on pump during normal
operation. submerge the complete pump in a
disinfectant solution (dilute chlorine bleach) for at
least one hour before disassembly.
5. using a feeler gauge, measure the cutting clearance
between the cutting rotor and the cutting plate. see
Figure 6.
6. If cutting clearance is more than .007” (0.2 mm)
wedge the cutting rotor with a piece of wood and
unscrew socket head capscrew.
7. remove compression washer, cutting rotor, and one
adjusting shim. replace cutting rotor, compression
washer and socket head capscrew.
8. Block cutting rotor with a piece of wood and tighten
socket head capscrew to 5.9 ft-lb (8 nm).
9. Verify cutting rotor moves freely and cutting
clearance is less than .007” (0.2 mm). If clearance is
still too large, repeat steps 6-9.
Cutting Plate
after cleaning and sanitizing the pump, inspect the cutting
plate and verify absence of cracks, tears or gouges.
1. If damaged, replace cutting plate by removing
cutting rotor (as described above), then remove four
socket head capscrews that attach plate to volute.
2. replace cutting plate and four socket head
capscrews. tighten capscrews to 5.9 ft-lb (8 nm).
3. replace adjusting shims, compression washer,
cutting rotor and socket head capscrews.
4. Block cutting rotor with a piece of wwod and tighen
socket head capscrew to 5.9 ft-lb (8 nm).
5. Verify cutting rotor moves freely and cutting
clearance is less than .007” (0.2 mm). If not correct,
repeat steps 6-9 in previous procedure.
Cleaning the Impeller
1. to clean the impeller and volute, remove the cutting
rotor, as described previously.
2. unscrew four 5 mm allen screws attaching the
volute and remove the volute casing. It may be
necessary to tap around the parting line with a lead
or rawhide hammer to loosen the casing.
Risk of cuts . Worn impellers can have sharp
edges that could cut or scratch. Wear protective gloves.
3. carefully clean the impeller and volute surfaces.
Inspect for obvious cracks or damage.
4. reverse steps 1 to 3 to reassemble the pump.
6259 0910
Figure 6: Cutting clearance measurement location.
