Morehouse UCM - Universal Hydraulic Pump; Calibration

Universal Calibrang Machine
(UCM) Manual
(PM-5201)
Morehouse Instrument Company, Inc.
1742 Sixth Ave., York, PA 17403-2675 USA
Phone: (717) 843-0081
www.mhforce.com
Page 29
Rev. 3/2024
During pump operaon, the ll plug on the upper right side of the pump body should be open about two turns
to serve as a reservoir vent. The operaon of the hand pump is enrely convenonal. Operang the hand
lever causes oil to be pumped from the reservoir to the outlets. When the relief valve is closed (handle rotated
toward the hose connecon on the pump body), pressure is developed within the pump. Opening this valve
relieves the oil back to the reservoir. When operang the relief valve, use modest pressure on the handle.
The ne adjustment vernier piston is a small-displacement precision piston. Aer pressure has been built up by
means of the hand lever to obtain the approximate force desired, rotate the hand wheel to operate the vernier
piston and maintain a precise force. We recommend that the vernier piston adjustment be kept at its mid-po-
sion of travel to allow small increments of force to be increased or decreased. Experience will dictate the best
posion for individual requirements. A lile pracce in the use of this pump will enable extremely precise force
applicaon by means of the pump and jack.
If the hand pump and hydraulic jack seem rather “spongy” during use, there may be air in the system. If this
occurs the system will need to be bled of the entrapped air. The procedure for bleeding the entrapped air is
outlined in secon 6.2.
Caution: Do not attempt to exceed the 1-inch stroke of the ram in the jack cylinder. Considerable damage may
result if pressure is applied after the ram has reached its limit of travel.
4.5 Universal Hydraulic Pump
The Universal Hydraulic Pump (Figure 6) is an electric motor-driven pump for use with calibrang machines
with capacies of 60,000 lbf (250 kN) and higher. It comes standard with all machines 100,000 lbf (500 kN) and
higher. It replaces the hand pump, thus eliminang the eort required to operate the hand pump. To use the
Universal Hydraulic Pump refer to the operang instrucons supplied with it (Universal Hydraulic Pump In-
strucon Manual).
Cauon: Before use, check the hose and ngs for any potenal leaks and ensure 1 reservoir screw is loos-
ened to vent the system.
4.6 Calibraon
Once the reference standard and the unit under test have been installed into the UCM and the operator is pro-
cient in the use of the hand pump, calibraon of the unit under test can be performed.