Alamo HYDRO 15 - Manual (Page 19)

Section 2 - 3
HYDRO 15 (Service Manual) 09/06
© 2006 Alamo Industrial
Recommended To Test Old Hydraulic Pump before it is Removed:
(Before Installing a New or Rebuilt Pump).
A. Connect your Flow Meter in Line to test Pressure as unit is started; this is in case the Relief Valve is
malfunctioning or has been tampered with. If this is not done you could damage the replacement Pump
because you would not Know it until Pump failed from excessive pressure.
B. Before connecting any lines to Pump, fill all Ports with clean Oil to provide initial Lubrication. This is
especially important is Pump is located at a higher level than Oil Reservoir.
C. Check Oil level in reservoir, fill to full level if needed, Reservoir must have more Oil than the Pump GPM
capacity.
D. After connecting the Lines and mounting the replacement Pump, make sure that Oil is not warmer than
Pump temperature. If Oil is warmer than pump run Pump at short intervals till Pump and Oil temperature
is equalized. Hot Oil must not be fed into cold Pump.
E. Operate the Pump for at least two minutes at no load and at low RPM (400 RPM min and 1400 RPM max.).
Watch Flow Meter Pressure (or Pressure Gauge). During this break-in period, the unit should run free and
not develop an excessive amount of heat. Heat should not exceed 100 deg F. above ambient Temperature.
If the unit operates properly, speed and pressure can then be increased to normal operating settings.
Increase Pressure in 500 Lbs. PSI increments from start, this should take 4 to 5 minutes to max. PSI
allowing 1 minute between increases to check Oil Pressure and Temperature.
F. If normal Pressure and Heat readings are seen then the New or Rebuilt Pump installation should be done,
remove Flow Meter (Pressure Gauge) from line, reconnect Line and check all connections.
Test Equipment Needed:
1. Flow Meter, The Flow meter should have components to measure:
A.
Guage to Measure the Oil Temperature.
B. Gauge to Measure Oil Pressure PSI (Load and No Load).
C. Gauge to Measure Oil Flow in G.P.M.
D. A Valve to load system to check operating Pressure (PSI).
E. Assortment of Connections to connect to Hydraulic System.
2. Electrical Volt Meter with variable settings and Ohm Meter.
3. Electrical Test Light.
4. Wrenches, (Socket Wrenches, Open and Boxed End Wrenches).
Flow Testing the Pump:
(figure 1)
1. Use a Flow Meter that is rated to 6000 PSI and 60 GPM Minimum. This applies to the gear type pump
and motor type only
2. the area around the hoses, motor, flow meter must be clean of all debris and dirt. NO contamination can
be allowed to enter the system or its components. Make certain there is nothing in flow meter from
previous use that will contaminate the hydraulic system, dirty and contamination in test equipment
hoses and valves can cause a failure to occur.
3. Disconnect the hydraulic return hose from the motor. Connect the hoses to the flow meter as shown
above, recheck all connections to make certain they are connected correctly and fittings have been
check for tightness.
4. Completely open the pressure valve on the flow meter.
PUMP SERVICE & REPAIR