MULTIQUIP MAYCO LS600 Operation And Parts Manual Download

Page: 39 / 152

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

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