D/G-04 Maintenance
NOTE: The numbers in parentheses are the Ref. Nos. on the illustrations in the Parts Manual.
Daily
Check the oil level and the condition of the oil. The oil level should be 1/4 in. (6 mm) above the cast surface in the upper oil reservoir.
Use the appropriate
CAUTION: If you are losing oil but don’t see any external leakage, or if the oil becomes discolored and contaminated, one of the diaphragms (17) may be damaged. Refer to the
CAUTION: Do not leave contaminated oil in the pump housing or leave the housing empty. Remove contaminated oil as soon as discovered, and replace it with clean oil.
Periodically
Change the oil after the first 100 hours of operation, then change according to the quidelines below. When changing, remove the drain plug (60) at the bottom of the pump so all oil and accumulated sediment will drain out.
Hours Between Oil Changes @ Various Process Fluid Temperatures
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| <90° F | <139° F | <180° F |
Pressure | RPM | (32° C) | (60° C) | (82° C) |
<1500 psi (100 bar) | <1200 | 6,000 | 4,000 | 2,000 |
| <1800 | 3,000 | 2,000 | 1,500 |
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<2500 psi (170 bar) | <1200 | 3,000 | 2,000 | 1,500 |
| <1800 | 1,500 | — | 1,000 |
NOTE: Minimum oil viscosity for proper hydraulic end lubrication is
NOTE: Use of an oil cooler is recommended when process fluid and/or hydraulic end oil exceeds 180° F (82° C).
CAUTION: Do not turn the drive shaft while the oil reservoir is empty.
Check the inlet pressure or vacuum periodically with a gauge. If vacuum at the pump inlet exceeds 7 in. Hg (180 mm Hg), check the inlet piping system for blockages. If the pump inlet is located above the supply tank, check the fluid supply level and replenish if too low.
CAUTION: Protect the pump from freezing. Refer also to the “Shutdown Procedure”.
Shutdown Procedure During Freezing Temperatures
Take all safety precautions to assure safe handling of the fluid being pumped. Provide adequate catch basins for fluid drainage and use appropriate plumbing from drain ports, etc., when flushing the pump and system with a compatible antifreeze.
1.Adjust the discharge pressure regulating valve so the pump runs under minimum pressure. Stop the pump.
2.Drain supply tank; open any draincocks in system piping and collect drainage. Drain as much fluid from the pump manifold and plumbing attached directly to the pump manifold by loosening fittings or removing plugs or gauges.
3.Close draincocks in system piping and tighten or replace any fittings, gauges or plugs.
4.Fill supply tank with enough antifreeze to fill system piping and pump.
NOTE: Disconnect the system return line from the supply tank and connect it to a separate reservoir.
5.Start the pump and allow it to run until the system is filled with antifreeze. NOTE: If the system has an airlock and the pump fails to prime, follow step 4 of the Initial Start- up Procedure to clear the air.
6.When mostly antifreeze is flowing from the system return line, stop the pump. Connect the system return line back to the supply tank and circulate the antifreeze for a short period.
7.It is also good practice to change the oil in the hydraulic end before storage for an extended period. This will remove any accumulated condensation and sediment from the oil reservoir. Drain and refill the hydraulic end with the appropriate
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