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MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04) — PAGE 51
ST-45HRM CE CONCRETE PUMP— MAINTENANCE (PUMP)
HYDRAULIC OIL SYSTEM MAINTENANCE
1. When changing the hydraulic oil or topping off the reservoir,
use only the following type. (Reservoir capacity is 220 liters/
58 gal.)
Hydraulic oil: Shell Oil Tellius 68, Mobil DFE 26, Texaco Rand
HDC or equavalent.
This Mayco.Multiquip 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 month.
WARNING
DO NOT mix oil brands! This may impair
quality.
NOTE
Use only a 6.4 cm (2-½") 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.
WARNING
2. Lubrication: Grease daily/Hour
■
Main hydraulic cylinders - 2 Place
■
Remix bearings - 2 Place
■
Axle crank - 1 Place
■
Suttle cylinders - 2 Place
■
“S” tube outlet flange - 3 Place
Grease Type: Lithium Based EP
Texaco Multitak 20
Lubriplate ED-2 or Equavalent
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
10°C (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 10°C (50°F). Cycle the machine at 6-8
strokes per minute at approximately 1/3 throttle.
In areas where the weather normally remains under 10°C
(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 will be the end result.
5. Add water to the hopper. Pump and flush clean the entire
hopper, shuttle tube and discharge elbow with water.
6. Scoop out 30.5 cm (12-inches) of concrete from the inboard
end of the delivery hose. “Cork Screw” a 15 cm x 15 cm x 20
cm (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 Model ST-45 has been used to pump small
aggregate concrete (pea rock,
1.3 cm /1/2-inch or smaller)
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 the shuttle tube
inspection plate (follow the Shuttle Tube Inspection
Procedure, pages 26-27) and remove all remaining
concrete.
9. When the Model ST-45 has been used to pump large
aggregate concrete 1.9 -3.8 cm (3/4 to 1-1/2 inches) follow
the instructions in step 8 once per week.
NEVER use muriatic acid to clean the pump.
Acid will dissolve the chrome finish on
material cylinder bore and main hydraulic
cylinder rods.
ENGINE (Hatz Model 3M41 57 HP Diesel)
The ST-45 is equipped with a Model 3M41 57 HP diesel engine.
For information concerning the procedure in checking, removing,
cleaning, etc. of the various engine parts or any other information
on the engine not contained herein, refer to the engine
manufacturer’s instruction manual.