Assembly - Grundfos MTR 15 Service Instructions Manual

4.3 Assembly

4.3.1 Assembling the chamber stack
1. Fit the neck rings into the chambers pos. 45, if removed.
2. MTR 15 and 20:
Fit the wear rings on the impellers pos. 49a, if removed.
3. Place the shaft holder
4. Fit the shaft pin pos. 10 into the shaft pin hole, place the shaft in the shaft holder and tighten the vice.
5. Check that the lock ring of the shaft pos. 51 is not damaged.
6. Fit the driver pos. 61.
7. Fit the chamber stack parts on the shaft: chamber, spacing pipe, impeller and bearing ring, see
assembly for chambers and
Note: When fitting the chamber stack, make sure that bearings and other rotating parts are not dropped
on the shaft. They must be slid carefully over the shaft to prevent any damage to bearings.
8. Fit the splined clamp pos. 64c, washer pos. 66 and nut pos. 122 and tighten to the torque stated, see
Torques and lubricants.
9. Fit the gasket pos. 37.
10. Slacken the vice and fit the chamber stack on the pump head pos. 2.
11. Fit the inlet parts pos. 44 and 121, the strainer pos. 84 and the straps pos. 26a.
Note: The holes for the straps are positioned asymmetrically.
12. Fit the washers pos. 66a and the nuts pos. 36 fixing the straps to the pump head.
13. Check that the straps are straight (parallel with the shaft), and tighten the screws alternately to ensure
that the chamber stack is clamped straight.
Tighten to the torque stated, see
4.3.2 Fitting the shaft seal, coupling and motor
1. Assemble the chamber stack, see
2. If necessary, clean and smooth the shaft end using the holder with emery cloth supplied with the shaft
seal kit.
3. Moisten the shaft end with soapy water.
4. Press the shaft seal on the shaft, screw it into the pump head and tighten it with 35 Nm using the ring
insert tool for shaft seal
5. Press home the shaft.
6. Press the ring with the three set screws pos. 113 against the hexagon plug.
7. Tighten the screws pos. 113 with 2.5 Nm.
8. Lift the chamber stack by inserting a screwdriver or similar tool in the hole for the pin in the shaft and fit
the adjusting fork fitted to one of the coupling guards.
9. Fit the motor to the pump head.
10. Fit the screws pos. 28, lubricate and tighten them diagonally to the torque stated, see
lubricants.
11. Fit the pin pos. 10 and the two coupling halves pos. 10a.
12. Lubricate the four screws pos. 9 with Thread-Eze and fit them.
pos. A in a vice, but do not tighten the vice.
impellers.
2. Torques and
4.3.1 Assembling the chamber
pos. B.
Fig. 5 Fitting the adjusting fork
lubricants.
stack.
# / 18
5. Order of
2.
2. Torques and