Assembly; Suction Valve Removal And Installation; Actuator Neck Seal Removal And Installation; Crankshaft Removal And Installation - Generac Power Systems MAGNUM Owner's Manual

Maintenance

Assembly

Install the vacuum pump support table and oil res-
1.
ervoir.
Orient the oil reservoir so that the inlet and outlet
2.
ports are on the same side of the pump as the inlet
and outlet ports of the gland.
Install the oil lines between the gland and reservoir.
3.
The upper and lower ports of the gland and
reservoir should be connected together.
Install the pulley on the pump main shaft. Position
4.
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.
Install the SAE adapter bracket to the adapter
support bracket. Install the engine drive coupling.
Place the vacuum pump on the support table and
5.
loosely install the bolts and nuts.
Place the drive belt over the pulleys on the main
6.
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). Check the belt tension after tightening
the vacuum pump mounting bolts. The belt need
only be tight enough to prevent "jumping" from one
tooth to another.
Connect the air hose between the inlet on the
7.
bottom side of the vacuum pump housing and the
priming valve nozzle. Verify 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 cham-
ber to vacuum pump hose connections for leakage.
Verify the drain plugs are installed and fill the oil
8.
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.
Once the pump assembly has been mounted to the
9.
baseplate, and the couplings between the pump
shaft and driver have been installed and aligned,
replace the vacuum pump belt guard halves. Bolt
the halves to each other and then to the support
table.
Check all bolts for tightness.
10.
Suction Valve Removal and

Installation

Remove the hose to the priming chamber.
1.
56
Remove the four 3/8 in. nuts.
2.
Remove the suction valve elbow and discard the
3.
gasket.
Lift the valve over the head of the valve stud; do
4.
not remove the bolt.
Clean the valve chamber and seat.
5.
Lubricate the valve stud and push the new valve on
6.
over the head of the stud. Tuck the elastomeric
shoulder of the valve completely under the head of
the valve stud.
Fit the new gasket and install the suction valve
7.
elbow and 3/8 in. nuts.
Connect the priming chamber hose and tighten the
8.
hose clamp.
Actuator Neck Seal Removal and
Installation
Remove the actuator assembly as described in
1.
Suction Valve Removal and
Remove the priming chamber hose from the
2.
suction nozzle.
Remove the four hex nuts holding the lower
3.
housing to the pedestal.
Remove the vacuum pump lower housing and
4.
actuator neck seal.
Lubricate the new actuator neck seal and push it
5.
into the vacuum pump lower housing.
Fit the assembly over the actuator shaft.
6.
Orient the vacuum pump inlet suction nozzle to
7.
face the priming chamber and install the four hex
nuts.
Install the actuator/seal assembly and remaining
8.
components. Refer to
and Installation.
Crankshaft Removal and
Installation

Removal

Remove the actuator neck seal as described in
1.
Actuator Neck Seal Removal and
Remove the 1/2 in. NPT drain plug from bearing
2.
housing; drain and discard oil.
Remove the four 3/8 in. capscrews from the
3.
pedestal lower flange.
Carefully remove the vacuum pump pedestal
4.
complete with seals and linear bearing. Remove
and discard the O-ring taking special care not to
damage the actuator rod surface.
Remove the four 1/4 in. capscrews from the
5.
inspection plate.
Owner's Manual for Dry-Prime Diesel Trash Pumps
Installation.
Suction Valve Removal
Installation.