Multiquip MG30M2D - Manual (Page 19)

MAYCO MG-30 PUMP — OPERATION AND PARTS MANUAL — REV. #3 (09/15/11) — PAGE 19
MG-30 PUMP — GENERAL INFORMATION
Main Bearings
The two main crankshaft bearings are sealed bearings. These
bearings should be greased about every two days of pump
operation. Any good lithium base grease is acceptable. Too much
grease cause the bearings to overheat.
Rocker Arm Shaft
The two rocker arms have bronze bearings. These bearings
should be greased
every day of operation.
Rod Ends
Each piston rod and connecting rod from the crankshaft has a
roller bearing. Lubricate these four roller bearing daily with lithium
base grease.
Cylinders
The cylinder walls do not wear to any degree. Care should be
taken not to damage the surface on the ends of the cylinders as
this will cause an air leak between the end of the cylinders and
the pump housing.
Pump Housing
There are 3 sections to the pump housing, hopper elbow , main
housing (center), and crossover housing . These 3 housings
are held together with "T" slot bolts and are aligned to each
other with guide rings on the flange surface.
Always assemble these 3 sections into a complete unit before
placing it on the pump. It is important that when the pump housing
unit is placed on the pump that all of the gaskets and o-rings are
aligned properly with an air tight fit.
Rubber Check Ball
Rubber check balls (not steel) are used in plaster and stucco
applications, because they form a water tight seal at the valve
seat. This prevents the check valve from packing due to
separation at the valve.
Daily lubrication of the roller bearings
(except main bearing) will prevent any
dirt and foreign matter from entering the
bearings.
NOTE
NEVER! use muriatic acid to clean the
pump. The cylinder bore is chrome
plated . Muriatic acid will dissolve the
chrome.
NOTE
The rubber check balls are components of the pump that will
wear quite
rapidly and must be replace frequently. Excessive
high pressure is the main cause of wear to the rubber check
balls. The rubber check balls can last anywhere from a week to
2 or 3 days depending on the pumping pressure. Jamming the
pump or running the pump at a very high pressure may split the
rubber check balls.
Steel Check Ball
Steel check balls are used in fireproofing applications, because
they form a water tight seal at the valve seat. This prevents the
check valve from packing due to separation at the valve.
Leather Piston Cup
The piston, which is held to the push rod by a nut, consists of
several parts made of various materials with close tolerances,
having as the center a
pre-lubricated leather piston cup . This
cup is in constant contact with the cylinder and the material and
it wipes clean the cylinder on each stroke, thereby preventing
damage to the cylinder. When the machine is shut down, the
piston cups should be periodically inspected and replaced if
frayed or damaged.
The leather piston cups will outwear the rubber balls. The leather
piston cups as well as the rubber balls can be damaged
prematurely if exposed to
excessive pump pressure or
jamming of the pump.
Leather Piston Lubrication
Due to the close tolerance of the piston to the cylinder, the piston
is equipped with a felt ring to keep the cylinder constantly
lubricated for increased life. The felt ring is lubricated through
the oiler fitting and tubing installed at rear of piston.
The oiler tank is mounted adjacent to the fuel tank. The oil level
should be checked regularly during operation and tank filled,
if necessary, with a good grade of S.A.E. 20W or 30W motor oil.
Oiler tank capacity is 1.5 quarts (.709 liters).
With the engine running, open needle valve (located below oil
tank) very slightly. Oil should flow for approximately 5 minutes
before pumping material. This will allow oil to reach and penetrate
the felt ring. Opening the valve too far will cause oil to flow
excessively. Close the valve when the machine is not in use to
prevent all the oil draining from the tank.
When replacing either rubber check ball,
always inspect the other ball for signs
of wear. Make sure the o-rings and
associated parts are clean and free of
dirt when the rubber check valve is
reassembled.
NOTE