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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 operating
procedure, 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.
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. “Cork screw” a 6" x 6" x 8" sponge
into the end of the first hose section. Reconnect the
hose to the discharge elbow.
7. Fill hopper with water. Pump until sponge and clean
water come out 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 2½" diameter clean-out hook when back-
pumping into redi-mix truck. Use a safety chain to
secure the clean-out hook to some solid part of the
mixer truck to prevent hook from jumping off of the
drum. Run the pump at 6 strokes per minute maximum
speed.
NOTICE
use muriatic acid to clean the pump. Acid will
dissolve the chrome finish on material cylinder bore and
main hydraulic cylinder rods.
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 break down. 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 machine until oil temperature reaches a
minimum of 50°F. 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. Cycle the machine at 6-8 strokes per minute at
approximately 1/3 throttle.
In areas where the weather normally remains under 50°F.,
use Shell Oil Tellus 46 (or the equivalent). The above steps
must be followed or severe damage to the main axial piston
pump can occur.
1. When changing the hydraulic oil or topping off the
reservoir (capacity 50 gal/189 liters), use only the
following type hydraulic oil:
Shell Oil Tellius 68
Mobil DFE 26
Texaco Rand HDC
2. The following components should be greased daily,
hourly if necessary:
Main Hydraulic Cylinders (2 grease fittings)
Swing Axle Bushing (1 grease fitting)
Shuttle Cylinder (2 grease fittings top and bottom)
Discharge Nipple (3 grease fittings)
Outtriggers Option (2 grease fittings)
NOTICE
DO NOT mix oil brands! This may impair quality.
MAINTENANCE