MULTIQUIP MAYCO LS300G, Operation Manual

Page: 49 / 90

MAYCO LS300G CONCRETE PUMP • OPERATION MANUAL — REV. #2 (09/09/19) — PAGE 49
MAINTENANCE
Cylinder Cup 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. Start the engine and turn on the pressure test switch.
Cycle pump in reverse until hydraulic system obtains
maximum pressure, then turn pump and engine off.
6. Remove ignition key and disconnect battery.
Think safety! Check the hydraulic gauges on panel
and make sure accumulator pressure reads zero. One
piston should be in the fully discharged position at the
end of the concrete cylinder.
7. Remove the three 3/8-16 × 3" bolts from the piston.
Remove the front faceplate.
8. Install two of the 3/8-16 × 3" bolts back into the piston—
DO NOT
tighten. Use the two bolts as leverage to
remove the rubber piston cup and rear components.
9. Obtain two 3/8-16 × 7" full thread studs (these studs
will be used to assist in assembly alignment). Insert
the two studs into the piston adapter. Coat the concrete
cylinder with grease.
10. Install the O-ring around the oiler plate. Install the
plate into the concrete cylinder utilizing the studs for
alignment.
11. Install the felt holder over the oiler plate. Install felt ring
into felt holder. Install the bronze ring.
12. Using silicon sealant place a small bead of sealant
material on the front of the rubber piston cup and the
rear of the face plate. Install over alignment studs and
into concrete cylinders.
NOTICE
Felt ring must be saturated with 30 wt. oil prior to
installation.
13. Insert one 3/8-16 × 3" bolt into the open bolt hole,
remove the alignment studs one at a time and install
the remaining 3/8-16 × 3" bolts.
Wear Plate And Cutting Ring Replacement
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.
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" × 1-1/4" bolts that hold the shuttle
tube to the nun plate and remove shuttle tube.
6. Using two small pry bars remove the rubber energizer
ring, steel insert ring and wear ring.
7. Clean out all concrete buildup in and around the
nun plate area with a wire brush.
8. Inspect the wear components for indications of wear.
The wear plate has two wear surfaces.
NOTICE
Before installing the 3/8" bolts, coat the back of the bolt
heads with silicon sealant. Torque all three bolts equally
at 55 lbf·ft each.
NOTICE
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.