3
SAFETY WARNINGS
n WARNING! Risk of electrical shock. Pumps are
supplied with a grounding conductor and grounding-
type attachment plug on the power cord (except
MG200-21L/P). To reduce the risk of electrical
shock, be certain that it is connected only to properly
grounded, grounding-type receptacle. DO NOT cut
off ground pin or use an adapter fitting. DO NOT
use an extension cord with this pump. When wiring
this pump follow all local electrical, safety codes and
ordinances as well as most recent National Electric
Code (NEC-ANSI/NFPA).
The MG200 Series grinder pumps have a GROUND
WIRE that is connected to a screw in the metal motor
housing. This wire goes to the receptacle or control
box which must be connected to a good outside
GROUND such as a metal water pipe or GROUND
STAKE driven at least 8 feet into the ground.
CALIFORNIA PROPOSITION 65 WARNING:
This product and related
accessories contain chemicals known to the
State of California to cause cancer, birth
defects or other reproductive harm.
DISMANTLING PUMP FOR
REPLACEMENT PARTS
Before dismantling pump for replacement parts, clean
pump thoroughly.
REPLACING GRINDER IMPELLER AND
GRINDER SHREDDING RING
All repairs must be done at the factory or at an
authorized Myers
®
service facility.
n CAUTION!
DISCONNECT ALL POWER AND CONTROL
WIRES TO MOTOR AT CONTROL PANEL BEFORE
STARTING DISASSEMBLY OPERATIONS. NEVER
RELY ON OPENING CIRCUIT BREAKER ONLY.
DISASSEMBLY OF SHREDDING RING
AND GRINDER IMPELLER
1. Remove three screws from grinder ring flange.
Grinder ring is pressed into flange for easy
removal.
2. Using Allen head socket wrench, thread two
screws into tapped back-off holes in flange. Evenly
tighten screws to guide grinding ring out of pump
volute case.
3. Hold grinder impeller by prying against impeller
cutting bar and remove cap screw from end
of shaft.
4. Use large screwdriver in slot in end of shaft
and bump on cutter vane with plastic hammer.
Bump in counterclockwise direction as thread
is right-hand. It may take several bumps to
loosen impeller.
DO NOT CONTINUE TO POUND ON IMPELLER
AS IMPELLER AND SHAFT MAY BE DAMAGED.
5. If impeller comes off easily, clean and replace
if worn.
6. Be sure pump impeller has not loosened when
grinder impeller is removed. This can be checked
on reassembly of grinder impeller and shredding
ring. Tips of impeller cutter vanes should extend
about 1/8" below bottom of shredding ring. If
distance is more, it means the pump impeller has
loosened, and if it is less, it means the shredding
ring is not properly seated.
If the pump impeller has loosened, remove grinder
impeller and shredding ring as described above
and remove bolts from volute case and remove
case. Plastic hammer can be used to bump on
casing discharge to loosen. Place gasket in oil
to prevent drying out. DO NOT loosen the pump
impeller further – it is the seat for the seal spring.
7. After case is removed, wrap emery paper around
shaft and hold with vice grip pliers. Use cloth
on impeller and screw up against shoulder. Now
pump can be reassembled.
8. Clean all threads with wire brush and file; smooth
any threads that may have been nicked.
liquid-tight
connector
230V
pump
230V
power
source
junction
box
black
white
L1
L2
G
G
L1
L2
G
230 VAC
In 230 VAC pump installations, one side of
the line going to the pump is always HOT.
This condition exists if the switch is on or
off. Install double pole disconnect on all
230 VAC pump circuits.
n WARNING
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