Harken HYDRO 2 Power Unit - Manual (Page 11)

Hydro 2 11
Hydraulic Installation
Manifold Blanking Plates
All manifold stations must have either blanking plates or valves. Once all functions have been assigned, attach blanking plates to
stations not in use. Tighten #10-24 bolts to 4.1 ft-lb (5.6 N-m) torque. The unit is shipped with the number of valves ordered. Additional
valves may be added if blanking plates are present.
Flushing Hoses
Flush hoses prior to connecting to HPU, if not done when purchased. Use an external filtration pump (not included) to remove all debris.
Connecting Hoses
Install hoses per predetermined route.
• If hose end fittings differ, verify mating fittings prior to running the hose.
• Remove plugs from the HPU manifold and function ports to connect A and B hoses.
To prevent filled hoses from draining, connect the lower of the two ends first. This is typically the HPU.
• Attach the other hose end at the higher connection.
• If case drain hoses are required, continue with the same procedure used on A and B hoses.
• Plug all unused A and B ports to prevent contamination.
Any unused A and B ports with a valve must be plugged with ORB plugs.
IMPORTANT! ORB, BSPP and JIC connections do not need PTFE tape or other sealing.
Case Drains
Function motors with drain ports must be routed to a common case drain on the HPU during the installation. T-fittings may be used
to connect multiple drain port hoses to one common hose that leads to the case drain. Line sizing should be based on maximum
flow in order to prevent flow restriction and back pressure.
Example: The Hydro 2 unit is sized to fully power two functions or one double flow function at a time. To allow for free flow
back to the HPU, the common case drain hose that combines flow from all drain port hoses must be up-sized.
The recommended minimum hose size for function drain ports should be ¼" inner diameter (ID).
Mounting Clamp Hose Support
Support hoses using mounting clamps to prevent chafing and premature failure. Remember to allow for 2% to 4% shortening
when pressurized.
Protect Hydraulic Hose from Sunlight
Sunlight leaches out elastomers causing the cover to weather check or develop cracks deep enough to allow moisture penetration of
reinforcement. Use protective hose covers and/or store under protective cover when not in use.
Individual Function Protection
Some equipment may require lower max flow or lower max pressure than the hydro unit can deliver. Use a flow control valve, pressure
reducing valve and/or pressure relief valve to reduce maximum flow and/or maximum pressure. These valves are not included with the
Hydro 2 unit. They should be purchased as required by the original equipment manufacturer.