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Woodward 20 Series Rotary Gear Pumps Support and Parts Availability The Woodward 20 Series Rotary Gear Pumps were designed to supply oil from 175 to 200 PSI, typically to Gateshaft style governor systems. The system included a gear pump, unloader, check and relief valves, and an air-over-oil pressure tank. A unique feature was its ability to recharge its own air head. With proper maintenance and care even the oldest models can continue to provide reliable service well into the future. These pumps were supplied in multiple sizes:      Size 21      Size 23 1/2 to 24 1/2      Size 25 to 26 1/2      Size 27 to 27 1/2 The size of the pump is important for proper support. The pump size and serial number are marked on the side of each pump tank. Typical 20 Series Pump Support Services Offered by American Governor Company:      •  Parts and Gaskets Required for Routine Maintenance      •  Maintenance Recommendations      •  Pump Air/Oil Balancing Procedures      •  Replacement Exchange Program - Pumping Elements      •  Drive System Replacement - Chain to V-Belt Drive Upgrades      •  On Site Service and Support Cutaway View of a 20 Series Pump Pumping Element Replacement-Exchange Program: After many years of service, the 20 Series pump may begin to lose its ability to pump effectively. This becomes apparent when the pump is required to pump air into the accumulator during the pump balancing procedure. The loss of pumping ability does not mean that the system must be replaced. The degradation in pumping ability is usually the result of excessive end clearance and tolerance issues within the pumping element chamber. The replacement/exchange process consists of four steps:     1) AGC Supplies a Reconditioned Pumping Element Assembly     2) Customer Removes Old Pumping Element Assembly     3) Customer Installs New Pumping Element Assembly     4) Old Pumping Element Assembly is Returned to AGC Chain Drive Replacement System: The original chain drive systems provided with some 20 Series Pump systems have proven to be problematic. A replacement system has been designed to change the chain system to a V-Belt system. A kit can be provided based on the following information: pump size, pump serial number, motor shaft size, motor frame size. Size 26 V Belt Kit Riveted Tanks: Some customers have expressed concerns over the riveted tanks used on early 20 Series Pumps. While the exact factors of safety and modern day code compliance may be in question, it should be noted that the tanks are not just riveted together, they are also brazed as shown in the two photos below. Brazed Tank - Inside Brazed Tank - Outside This information can come in handy as customers evaluate the status of their existing pumping systems. Woodward 20 Series Rotary Gear Pump Parts and Reference Numbers: Reference Numbers are taken from Woodward manual 15001H (Rotary Gear Pumps Woodward Hydraulic Governors Manual 15001H) Note: Because of different pump sizes, there can be multiple part numbers for each reference number. Common Maintenance Items Reference Number Description Part Number 15001-24 Pressure Gauge (0-400 PSI) 197580 15001-24 Pressure Gauge (0-600 PSI) 197579 15001-33 Spring (Pilot Valve, 20 Series Pump, 200 psi) 191022 15001-37 Pilot Valve Bushing 150273 15001-39 Pilot Valve Plunger 150274 Major Overhaul Parts Reference Number Description Part Number 15001-41 Unloader Piston-Pump Size 21 to 23-1/2 150370 15001-41 Unloader Piston-Pump Size 24 to 25 150019 15001-41 Unloader Piston-Pump Size 26 to 27 150369       15001-42 Unloader Piston Ring-Pump Size 21 to 23-1/2 188541 15001-42 Unloader Piston Ring-Pump Size 24 to 25 188543 15001-42 Unloader Piston Ring-Pump Size 26 to 27 188544       15001-43 Unloader Spring-Pump Size 21 to 23-1/2 191069 15001-43 Unloader Spring-Pump Size 24 to 25 191062 15001-43 Unloader Spring-Pump Size 26 to 27 191089       15001-46 Safety Ball-Pump Size 21 to 23-1/2 189462 15001-46 Safety Ball-Pump Size 24 to 25 188456 15001-46 Safety Ball-Pump Size 26 to 27 188661       15001-47 Unloader Plunger-Pump Size 21 to 23-1/2 150192 15001-47 Unloader Plunger-Pump Size 24 to 25 150193 15001-47 Unloader Plunger-Pump Size 26 to 27 150048       15001-48 Safety Spring-Pump Size 21 to 23-1/2 191066 15001-48 Safety Spring-Pump Size 24 to 25 191068 15001-48 Safety Spring-Pump Size 26 to 27 191069       15001-61 Gauge Glass-6.5 Inches Long 150008 15001-61 Gauge Glass-7.5 Inches Long 150141 15001-61 Gauge Glass-14 Inches Long 150569       15001-66 Rotary Seal-Pump Size 21, Shaft Size 15/16 1388-116 15001-66 Rotary Seal-Pump Size 22 to 23, Shaft Size 1-3/16 1388-118 15001-66 Rotary Seal-Pump Size 24 to 25, Shaft Size 1-11/16 1388-120 15001-66 Rotary Seal-Pump Size 26 to 27-1/2, Shaft Size 2-3/16 1388-122

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