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HYDROFIT™ Owner’s Information Manual
WARNING: The use and ownership of this work is defined in the legend upon the front page hereof.
viscosity and the oil cleanliness are important factors for the hydraulic system to operate
at peak performance level. The pump is equipped with a strainer to prevent debris from
entering the inlet line toward the control valve.
There is also the option of installing a heater in the oil tank to help maintain proper oil
viscosity. The oil heater is generally used in colder climates to maintain oil’s viscosity. It is
important to keep the oil within its specified operating temperature range so it can flow
smoothly to the jack assembly. The oil heater is mounted to the tank floor, submersed in
the oil, and operates on a preset thermostat. The unit contains a heater element, similar
to the heating element of a toaster, where an electric current is passed through it. The
element material resists the electric current and heat is produced, heating the
surrounding oil in the process.
The Control Valve
The hydraulic control valve regulates the amount of oil to and from the plunger and
cylinder assembly. The oil flow governs the speed at which the elevator rises and lowers.
The control valve performs three basic operations to ensure a smooth transition between
the start and stop of the elevator:
• A start-to-full-speed operation
• A full-speed-to-leveling operation
• A leveling-speed-to-stopping operation
The flow rate is regulated to meet the requirements of the three operations stated above.
In response to an up direction elevator call, the control valve passes oil to the plunger
and cylinder assembly. The motor/pump operates in response to an up direction call.
When the elevator descends, the weight of the elevator car and plunger assembly forces
the oil back through the hydraulic control valve. Once again, flow rate back into the tank
is regulated to meet the operational requirements.
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