10
190-999 Rev G
MT8 Maintenance (Cont’d)
This section explains how to disassemble and inspect all easily
serviceable parts of the pump.
CAUTION: Disassembly of the hydraulic end of the pump
should be performed only by a qualified technician. For
assistance, contact Wanner Engineering (612-332-5681) or
the distributor in your area.
When flow rate is determined by motor speed, it is controlled
using an inverter duty constant torque motor and VFD. Flow
rate functions can also be easily controlled using the Hydra-Cell
Control Freak and appropriate motor or by selecting the manual
adjust option.
CAUTION: If the pump is losing oil and no external leakage
is visible, or if the oil becomes discolored and contaminated,
the single diaphragm may be damaged.
IMPORTANT: Fluid such as engine oil, hydraulic
fluid, coolants, grease, etc. must be disposed of in
an environmentally safe manner. Some regulations
require that certain spills and leaks on the ground must
be cleaned in a specific manner. See local, state and
federal regulations for the correct disposal method.
1. Changing Hydraulic End Oil
a. If necessary, with the pump horizontal, remove drain
plug and oil fill cap (56) (D03-039-1250). Allow all oil and
contaminant to drain out.
Note: MT Series replacement parts kits (complete
kits and diaphragm kits) include the correct oil for
each specific MT Series pump configuration.
b. Install drain plug.
CAUTION: Do not leave contaminated oil in the pump
housing or leave the housing empty.
c. Fill the reservoir per the specification table on page 2.
Contact Wanner Engineering (612-332-5681) for more
details.
2. Hydraulic End Priming
a. Remove PRV port plate (Item 47) (190-047) exposing the
three air bleed valve assemblies (Item 34) (190-901).
b. Remove all three air bleed valve assemblies (Item 34)
(190-901) and main PRV relief assembly (Item 54) (190-
058).
c. Using a pipette, drizzle oil from crankcase into all three
air bleed valve assembly ports until full.
d. Set motor control or manual adjust gearbox to no more
than 50 pump RPM.
e. Turn on motor.
f. Bubbles will be observed coming from all three air bleed
valve ports. Allow pump to run until no more bubbles are
observed coming from ports. Oil may need to be added
to one or more of the air bleed valve ports during this
phase.
NOTE: DO NOT re-install main relief valve assembly.
g. Once all three air bleed valve assemblies have been
reinstalled, re-start pump. Bubbles will be observed
coming from main relief valve port.
IMPORTANT: Run pump for a minimum of 10 minutes, or
until no more bubbles can be seen escaping from main
relief valve assembly port (this may take much longer
than 10 minutes, but this step is crucial to making sure
all the air is removed from hydraulic end of pump).
h. Stop the pump.
i. Re-install the main PRV assembly.
Drain Plug
Oil Fill Cap
47
54
34
