Supersedes Bulletin 398 dated 03/15/1984
Housing Pressure Regulator Fittings
The housing pressure return line connectors currently used in “D” series pumps are listed in the following chart. The operating pressure for each regulator fitting, the type of fitting, and the thread sizes are also provided in this chart. Housing pressure is normally checked at the full load rated speed and pressure fluctuations up to 2 psi are considered acceptable. Always refer to the individual pump specification for exact parameters.
| P/N | Type | Governor Cover End | Return Line End | Pressure Range (PSI) |
|---|---|---|---|---|
| 13265 | Brass Elbow | 1/8-27 NPT | 7/16-20 External Thread & 45° Flare | 6.0 – 12.0 |
| 15830 | Steel, Straight | 1/8-27 NPT | 1/8-27 NPT Internal Thread | 6.0 – 12.0 |
| 16800 | Brass Elbow | 1/8-27 NPT | 1/2-20 External Thread & 45° Flare | 6.0 – 12.0 |
| 17356 | Steel, Straight | 1/8-27 NPT | Push on Barb for 1/4” I.D. Hose | 6.0 – 12.0 |
| 20154 | Steel, Straight | 1/8-27 NPT | 1/8-27 NPT Internal Thread | 10.0 – 20.0 |
| 21251 | Steel, Straight | 7/16-20 UNF | 1/8-27 NPT Internal Thread | 6.0 – 12.0 |
| 22109 | Steel, Straight | 7/16-20 UNF | 1/8-27 NPT Internal Thread | 8.0 – 12.0 |
| 23183 | Steel, Straight for use with HPCA | 7/16-20 UNF | Push on Connection for 1/4” I.D. Hose | 8.0 – 14.0 |
| 23645* | Steel, Straight for use with HPCA | 7/16-20 UNF | 1/8-27 NPT Internal Thread | 8.0 – 14.0 |
| 26564 | Steel, Straight | 7/16-20 UNF | M12 x 1.5 | 6.0 – 14.0 |
| 28973 | Steel, Straight | 7/16-20 UNF | M12 x 1.5 | 6.0 – 10.0 |
| 40998 | Steel, Straight | 7/16-20 UNF | M12 x 1.5 | 8.0 – 12.0 |
| 42429 | Steel, Straight | 7/16-20 UNF | M12 x 1.5 | 12.0 – 21.0 |
Housing pressure should be checked with a dampened pressure gauge, calibrated from 0-30 psi (0-207 kPa) with graduations of 1.0 psi (7 kPa) and an accuracy of plus or minus 0.5 psi (3.5 kPa). This gauge is attached to the available housing pressure port on the 39938 Electronic Advance Indicator. Reference Service Bulletin 562R1 for details.
Note: Fittings with 7/16-20 UNF external threads on the governor cover end are to be used with O-ring seal p/n 27607.