Alamo HYDRO 15 - Manual (Page 20)

HYDRO 15 (Service Manual) 09/06
© 2006 Alamo Industrial Section 2 - 4
PUMP SERVICE & REPAIR
5. Record all the readings during the test. Start the system, run at 540 PTO speed (which will run pump at
required speed) until the Oil temperature reaches at least 110° F. before starting test. Check the flow (GPM)
at 0 psi. (or no load). Slowly close the pressure control valve (valve on flow meter) until the gauge pressure
reaches 500 psi. and record the readings pressure, temperature and flow (GPM). Continues this at 500 psi
increments until a maximum of 2000 psi.
6. If the flow rate is 85 % or greater of beginning flow rate at no load, the pump is serviceable and functioning
within specifications.
CAUTION ! Stop tractor engine and discontinue testing if hydraoulic oil temperature exceeds 220° F. as
temperatures above this could cause damage to components.
Example: Recorded test results
PSI. GPM TEMP ° F. PSI. GPM TEMP ° F.
0 ____ ________ 500 ____ ________
1000 ____ ________ 1500 ____ ________
2000 ____ ________ 2500 ____ ________
3000 ____ ________
Shown Below is a Gear Pump Schematic
Figure 1