Product Manual A

Maintenance
31609 A MTP4000-6000DZV/DZD Operating Manual 65
Reassembly
1. Reinstall the vacuum pump support table and oil reservoir.
2. Orient the oil reservoir so that the inlet and outlet ports are on the same side of the pump as the inlet and
outlet ports of the gland.
3. Reinstall the oil lines between the gland and reservoir. The upper and lower ports of the gland and reservoir
should be connected together.
4. Reinstall the pulley on the pump main shaft. Position the toothed drive belt in the adapter support bracket
and install the pulley. Alternately, the pulley can be installed into the SAE adapter support bracket before the
belt is installed on the pulley. Reinstall the SAE adapter bracket to the adapter support bracket. Reinstall the
engine drive coupling.
5. Place the vacuum pump on the support table and loosely replace the bolts and nuts.
6. Place the drive belt over the pulleys on the main shaft and vacuum pump shaft. Place shims evenly under
the vacuum pump mounting until proper belt tension is obtained and tighten the bolts. A load of 3.0 lbs (1.36
kg) applied across the belt at mid-span should give a deflection at that point of 1/8 in. (3.17 mm). Recheck
the belt tension after tightening the vacuum pump mounting bolts. The belt need only be tight enough to pre-
vent “jumping” from one tooth to another.
7. Reconnect the air hose between the inlet on the bottom side of the vacuum pump housing and the priming
valve nozzle. Make certain that the clamps are properly tightened.
Note: During operation, once the pump is fully primed, no air should be felt exiting the vacuum pump exhaust. Close
off the vacuum pump exhaust with the palm of the hand. If air pressure builds, then check all priming chamber to
vacuum pump hose connections for leakage.
8. Ensure the drain plugs are replaced and fill the oil reservoir to within 1/2 in. (6.35 mm) of the upper level
glass. Check the oil level in the vacuum pump bearing housing and add oil if necessary. The oil level should
be visible in the center of the level glass. DO NOT OVERFILL.
9. Once the pump assembly has been remounted to the baseplate, and the couplings between the pump shaft
and driver have been reinstalled and aligned, replace the vacuum pump belt guard halves. Re-bolt the
halves to each other and then to the support table.
10. Check all bolts for tightness.
SUCTION VALVE REMOVAL AND REPLACEMENT
1. Remove the hose to the priming chamber.
2. Remove the four 3/8 in. nuts.
3. Remove the suction valve elbow and discard the gasket.
4. Lift the valve over the head of the valve stud; do not remove the bolt.
5. Clean the valve chamber and seat.
6. Lubricate the valve stud and push the new valve on over the head of the stud. Be sure to tuck the elasto-
meric shoulder of the valve completely under the head of the valve stud.
7. Fit the new gasket and replace the suction valve elbow and 3/8 in. nuts.
8. Replace the priming chamber hose and tighten the hose clamp.