Multiquip Mayco Concrete Pump LS600 - Manual (Page 39)

MAYCO LS600 PUMP — OPERATION AND PARTS MANUAL — REV. #4 (9/15/11) — PAGE 39
1. The lubrication level should be checked everyday prior
to pumping and maintained at a height of 5 inches or
about ½ the concrete cylinder height. We recommend
using a 30-weight motor oil.
2. As the rubber piston cups naturally wear, fine cement
particles will accumulate in the box. Once the concrete
paste reaches a height of about ½ inch from the bottom
of the box, drain and clean the lubrication box.
CLEANING THE LUBRICATION BOX
1. Remove the top cover and the drain plug (Figure 40)
located at the bottom of the box and fully drain the
inside of the box.
2. Once the box is drained, start the engine and stroke
the cylinder ( keep hands out of box) ten to fifteen
times.
3. While stroking, spray water inside of the box to
thoroughly clean out all contamination (Figure 40).
4. When the box is clean replace drain plug, add new
lubrication and install the top cover.
CYLINDER LUBRICATION BOX
Figure 40. Cleaning the Lubrication Box
LS600 PUMP — MAINTENANCE (PUMP)
ACCUMULATOR CIRCUIT
Figure 41. Accumulator
CHECKING ACCUMULATOR BLADDER PRESSURE
The normal accumulator charge pressure should be
approximately 1100 PSI. To check the accumulator
pressure:
1. Start the engine and stroke the pump. The
accumulator pressure gauge (Figure 30) should read
1750 PSI.
2. To determine the actual accumulator PSI, stop the
engine and observe the pressure gauge. As the PSI
reading slowly decreases, it will reach a point where
there will be a sudden drop in the PSI. The PSI reading
should be taken just prior to this sudden drop. If you
do not read 1100 PSI, the accumulator may require
charging or bladder replacement.
When the pump cycles, a part of the stored oil is released
to the shuttle cylinder. This pressure release assures the
shuttle tube has enough force to shear the cylinder of
concrete passing from the concrete cylinder to the concrete
delivery line during the cycle phase.
Before checking lubrication level, follow lock out-tag
out procedures.Stop the engine and remove the engine
starter key.
Improper accumulator charging can result in an
explosion causing serious injury or death! NEVER use
oxygen or compressed air to charge the accumulator!
Only qualified personal should perform this procedure.
Use only
dry nitrogen to charge
the accumulator. Contact your
Mayco service department or
your local Hydac representative
for proper charging procedure.
The accumulator circuit has two functions in the hydraulic
system.
■ The accumulator circuit furnishes the hydraulic pressure
to cycle the shuttle tube.
■ The accumulator circuit also furnishes the pilot pressure
necessary to activate the hydraulic system.
The accumulator circuit is equipped with
a bladder type accumulator (Figure 41)
charged with 1100 PSI of dry nitrogen. The
accumulator stores one gallon of
hydraulic oil, which is, under 1750 PSI of
pressure.
CAUTION - SAFETY GUIDELINES
DANGER - ACCUMULATOR CHARGING
When using the pump during freezing conditions,
completely drain the water box and cover the hopper
after pumping. Frozen liquid will restrict the piston travel
and cause
severe damage to the pump.
WARNING - FREEZING CONDITIONS