Multiquip LS-300 - Manual (Page 42)

PAGE 42 — MAYCO LS300 CONCRETE PUMP • OPERATION AND PARTS MANUAL — REV. #4 (06/21/10)
CHANGING THE WEAR PLATE AND RING
Due to the swinging motion of the Nun-plate and the abrasive
nature of concrete, it is normal for the cutting ring to wear on
the side that shears through the concrete inside the hopper.
If the wear ring and wear plate do not fully seat against each
other the concrete slurry will pump into the hopper. This
condition can be easily observed by the sudden change of
the level of concrete inside the hopper during each stroke.
Wear Plate and Ring Replacement Procedure
1. Remove the two hydraulic hoses connected to the remix
motor. Plug the ports with fittings (not provided) to
prevent hydraulic hose leakage.
2. Remove the hopper discharge nipple and loosen sleeve
seal. Inspect and replace if wear is excessive.
3. Remove the two tie rod nuts and the four eyebolt nuts
securing the hopper to the pump frame.
4. Using an approved lifting device, remove the hopper
using extreme care not to damage the hopper seal.
5. Remove the four 1/2” 1-¼” bolts that hold the shuttle
tube to the nun-plate and remove shuttle tube.
Using two small pry bars remove the rubber energizer
ring, steel insert ring and wear ring.
MAINTENANCE (PUMP)
The energizer ring and wear ring will
normally have concrete contamination
holding them in position. It will be required
to chip some of the concrete loose to
better expose the energizer ring.
HEAT EXCHANGER COOLING FAN
This section is intended to make sure the fan is working
properly. Under normal conditions the fan should be running
any time the engine is turned on.
If the hydraulic oil temperature exceeds 170 degrees
Fahrenheit, shut down the pump. DO NOT continue
to operate the pump. Failure to shut down the pump will
result in severe damage to the pump.
CAUTION - HYDRAULIC OIL TEMPERATURE
6. Clean out all concrete build up in and around the nun-
plate area with a wire brush.
7. Inspect the wear components for indications of wear.
The wear plate has two wear surfaces.
Wear Plate Installation
1. Install the two cylinder “O” rings.
2. Using silicon sealant, coat the circumference of the
concrete cylinders, the back of the wear plate and around
the five bolt holes. Next, install the wear plate and the
five bolts. The bolts must all be equally snugged and
tightened to 100 foot pounds each.
Wear Ring installation
1. Install the wear ring into the nun plate.
2. Install the steel insert ring inside of the rubber energizer
ring.
3. Install the energizer ring assembly into the nun-plate.
After installing the above mentioned components the
machine can be reassembled by reversing steps 1 through
5 of the Wear Plate and Ring Replacement Procedure.