Multiquip ST-45HRM CE ST-45HRMCE CONCRETE PUMP— MAINTENANCE PUMP, Changingthe Wear Plate And Ring

ST-45HRM CE CONCRETE PUMP— MAINTENANCE (PUMP)

CHANGINGTHE 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 (Hopper Assy., Item 34) connected to the remix motor.Plug the ports with fittings(not provided) to prevent hydraulic hose leakage.

2.Remove the hopper discharge nipple (Hopper Interior Assembly, Item 21) and loosen sleeve seal. Inspect and replace if wear is excessive.

3.Remove the two tie rod nuts (Hopper Attachment, Item 19) and the four eyebolt nuts (Hopper Attachment, Item 22) securing the hopper to the pump frame.

4.Using an approved lifting device, remove the hopper (Hopper Assy, Item 1) using extreme care not to damage the hopper seal (Hopper Assy, Item 2).

5.Remove the four 1/2” 1-¼ “ bolts (Hopper Interior Assy, Item 43) that hold the shuttle tube to the nun-plate and remove shuttle tube (Hopper Interior Assy, Item 41).

Using two small pry bars remove the rubber energizer ring (Hopper Interior Assy, Item 13B), steel insert ring (Hopper Interior Assy, Item A) and wear ring (Hopper Interior Assy, Item 13).

The energizer ring and wear ring will

NOTE 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.

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 (Hopper Interior Assy, Item 52) has two wear surfaces. If it becomes necessary to replace, the plate can be reversed to the opposite side to expose a new flat surface. To replace or reverse the plate, remove the five allen head counter sink bolts.Then remove the two cylinder “O” rings and clean the entire back surface.

Wear Plate Installation

1.Install the two cylinder “O” rings (Hopper Interior Assy, Item 10).

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 ( 136-N-m (100 ft. lbs) each.

Wear Ring installation

1.Install the wear ring (Hopper Interior Assy, Item 13) into the nun plate.

2.Install the steel insert ring (Hopper Interior Assy, Item A) inside of the rubber energizer ring (Hopper Interior Assy, Item 13B).

3.Install the energizer ring assembly into the nun-plate.

After installing the above mentioned components the machine can be re-assembled by reversing steps 1 through 5 of the Wear Plate and Ring Replacement Procedure.

MAYCO ST-45HRM CE PUMP — OPERATION & PARTS MANUAL — REV. #0 (02/23/04) — PAGE 57