Accessories
74 Series 505G2 SilentFlo™ Hydraulic Power Unit
l A Model 505.07 Surge Suppressor kit (part number 100-008-667) or a Model 505.11 Surge
Suppressor kit (part number 100-008-665).
l Optional Remote Charging kit (part number 100-056-912)
l A transfer pump with a 10-micron filter (such as the Model 590.01 Fluid Transfer Pump).
l A cleaning solvent such as ethanol.
l A charging kit (part number 037-698-601).
Installation procedure
To install the Surge Suppressor Kit.
1. Ensure that system hydraulic pressure has been reduced to zero before proceeding. To do
this, turn off the hydraulic power unit and exercise the actuator until it stops moving.
2. Remove the electrical power to the HPU via a circuit breaker at the power source.
3. Open the top cover of the HPU. Use a 8-mm (5/16-inch) allen wrench to unlatch the cover.
4. Remove the filler cap and reservoir cover.
5. Remove the hydraulic fluid.
Use the transfer pump to remove the old hydraulic fluid out of the reservoir and into an
appropriate container. Open the fluid drain to remove any remaining fluid.
Note: Every part to be installed must be cleaned and wiped dry.
6. Remove the hose from the pump output port to the bottom of the control manifold.
7. Install the elbow (and reducer for the 505.11) to the surge suppressor cylinder. Torque the
fixtures to 33.9 N•m (25 lbf-ft).
8. Remove manifold from the reservior.
9. Install fittings inot the manifold inlet port.
10. Install the surge suppressor assembly into the manifold inlet port.
11. Reinstall the hose between the surge suppressor assembly and the pump outlet.
12. Install the remote charging line and bulhead fitting.
13. Precharge the surge suppressor.
14. Add new hydraulic fluid to the reservoir.
Pump hydraulic fluid (filtered to 10 microns) into the reservoir. Stop when the fluid level is full.
Reinstall the strainer assembly of the filter cap. Change the filter.
15. Run the HPU and check for leaks.
A. Press the Start switch.
B. Run the HPU at low pressure for about three hours to filter the new hydraulic fluid.
C. Run the HPU in high pressure to check for leaks.
D. Press the Stop button.
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