MAYCO LS450 CONCRETE PUMP • OPERATION MANUAL — REV. #2 (02/23/21) — PAGE 47
CLEANING THE PUMP AND DELIVERY SYSTEM
Cleaning the pump is a very important operation as it
determines how the machine will pump the next time it is
used.
At the end of every pour, or because of long delays during
a pour, the pump and delivery system must be thoroughly
cleaned by removing all concrete material.
1. Following the Clearing Concrete Blockage procedure
in the General Information section of this manual,
ensure that there is no blockage in the hose and line
or in the shuttle tube. If a blockage exists, clear it.
2. Pump concrete until the opening of the concrete
cylinder intake in the hopper is visible.
3. Stop the pump.
DANGER
AMPUTATION HAZARD
During routine
maintenance or
removal of material
blockage, you will be
required to put your
hand in the concrete
cylinders or near the
shuttle tube. You are at extreme risk of injury or
AMPUTATION if the engine is running or if pressure
is in the hydraulic system.
Prior to performing any maintenance on the pump,
follow described lockout/tagout procedures. Stop the
engine by turning off the ignition switch and remove
the starter key.
Place a DO NOT OPERATE tag over the switch and
disconnect the battery. The pressure reading on
the accumulator pressure gauge MUST read zero.
ALWAYS make sure the accumulator circuit pressure
reads zero prior to performing any maintenance on
the pump.
NOTICE
NEVER use muriatic acid to clean the pump. Acid will
dissolve the chrome finish on the material cylinder bore
and main hydraulic cylinder rods.
4. Carefully disconnect the first hose joint at the shuttle
tube discharge elbow.
5. Add water to the hopper. Pump and flush clean the entire
hopper, shuttle tube and discharge elbow with water.
6. Scoop out 12 inches of concrete from the inboard end
of the delivery hose. ‘Corkscrew’ a 6" × 6" × 8" sponge
into the end of the first hose section. Reconnect the
hose to the discharge elbow.
7. Fill the hopper with water. Pump until the sponge and
clean water come out of the discharge end of the hose
and line system.
8. When the pump has been used to pump aggregate
concrete or mixes with high fines content (60% or more
sand), there will be a tendency for hardened concrete
to build up on the inside surface of the shuttle tube.
Therefore, at the end of every such pour, after the pump
and system have been cleaned and the engine shut
off, remove all remaining concrete.
9. Use only a 2-1/2" diameter clean-out hook when back-
pumping into a ready-mix truck. Use a safety chain to
secure the clean-out hook to some solid part of the
mixer truck to prevent the hook from jumping off of the
drum. Run the pump at a maximum speed of 6 strokes
per minute.
HYDRAULIC OIL SYSTEM MAINTENANCE
This Mayco pump is equipped with an in-tank return
hydraulic filter with a 10-micron, cleanable filter. The
element has been designed to remove all particles large
enough to cause wear and job breakdown. Under normal
conditions, we recommend replacement every 6 months.
The most important factor to keep in mind is the effect of
cold weather on the hydraulic oil. The viscosity (thickness)
of the hydraulic oil will be much heavier.
ALWAYS run the machine until the oil temperature reaches
a minimum of 50°F (10°C) before pumping. Damage to the
main piston pump will occur if the machine is cycled too
fast before the oil temperature reaches the minimum of
50°F (10°C). Cycle the machine at 6–8 strokes per minute
at approximately 1/3 throttle.
MAINTENANCE
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