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4.7 OIL SEAL BELLOWS REPLACEMENT (ITEM 70 IN FIGURE 5-1)
BEFORE BEGINNING OIL SEAL REPLACEMENT, MAKE SURE ALL SHUT-OFF VALVES ARE
CLOSED AND ALL PRESSURE HAS BEEN BLED FROM THE LIQUID END (PUMP HEAD). WHEN
REPLACING THE OIL SEAL, THE DIAPHRAGM ASSEMBLY MUST BE REMOVED FIRST. FOR EASE
OF SERVICE, IT IS RECOMMENDED THAT THE OIL SEAL BE REPLACED IN CONJUNCTION WITH
THE DIAPHRAGM ASSEMBLY.
1. Set the stroke adjusting knob to 100%.
2. Disconnect the suction and discharge connections to the pump head check valves.
3. Mark the suction and discharge ports on the diaphragm head prior to removal. Loosen the head
screws (Item 103 or/ 435) and remove the diaphragm head (Item 370 in Figure 5-8).
4. Remove the motor fan cover and turn the motor by hand while adjusting the capacity control knob to
100%. With the capacity set at 100%, turn the motor fan until the diaphragm assembly is in the full
forward position (top dead center).
5. Hold the outer edge of the diaphragm assembly and turn it counterclockwise to unscrew it from the
pump drive.
6. Remove the diaphragm support ring (Item 700A) from the spacer.
7. Drain the oil out of the pump drive by removing the drain plug (Item 20 in Figure 5-2) from the pump
housing.
8. Remove oil seal bellows as follows:
a) On Liquid End Size GM0002~GM0050 models, remove mounting screws (700F), and spacer(351).
b) On Liquid End Size GM0090~GM0500 models, remove un-screw cross piece (701), mounting
screws (435B), and spacer (072A).
9. Pull the oil seal (70) off the connecting rod (60).
10. Install a new oil seal onto connecting rod.
11. Apply a thin layer of O-ring type grease to top of oil seal (part adjacent to connecting rod).
12.Reinstall parts removed in step 8. For Liquid ends GM0002~GM0010, GM0090~GM0500 install
cross piece (701) before mounting spacer.
13. Rell pump drive with oil (650 ml, oil model refer to chapter 3.1).
14. Reinstall liquid end components in accordance with the procedures found in the following:
a) For Liquid End Size GM0002~GM0010 models, refer to paragraph 4.6.1, steps 3 thru 6.
b) For Liquid End Sizes GM0025~GM0500 models, refer to paragraph 4.6.2, steps 5 thru 6.
4.8 RESTARTING THE PUMP
1. Reconnect the pump to the piping system.
2. Check that capacity is set to 0%.
3. Open system suction and discharge shut-off valves and restart pump.
4. Set the pump to 100% to obtain faster priming of liquid end.
5. After priming, set the pump to the desired capacity. Retighten locking screw (320).
CAUTION
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