Universal Calibrating 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. 11/2021
6.1 Disassembly and Reassembly
Procedures for disassembly and reassembly of the Morehouse Universal Calibrating Machine are evident from
the drawings provided. The parts list and drawing for the hand pump is included with this manual. Parts lists
and drawings for Morehouse Universal Calibrating Machines and hydraulic jacks are supplied with the calibrat
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ing machine. Recommendations regarding the disassembly and reassembly of the hand pump are included in
this section. All numbers in parentheses refer to items in Figure 14.
6.2 Air Bleed Procedure for Hydraulic Jack
If the hand pump and hydraulic jack seem rather “spongy” during use there may be air in the system. If this oc
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curs, bleed the system of the entrapped air. To bleed the hydraulic jack, remove it from the calibrating machine
and place it on its side on a bench, or other suitable work surface, then proceed as follows:
a) Check the supply of fluid in the pump reservoir by removing the fill plug (30). The fill plug must be left open
about two turns during operation to serve as a reservoir vent. If hydraulic fluid must be added be sure to use
petroleum based anti-wear hydraulic fluid with an ISO Viscosity Grade of 22 or 32 as recommended in Section
3.
b) With the hydraulic hose disconnected from the hydraulic jack and connected only to the hand pump, pump
the hydraulic hose full of hydraulic fluid. The poppet of the hose half of the self-sealing quick-disconnect cou
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pling must be depressed to accomplish this.
c) Connect the hydraulic hose to the jack cylinder fitting, and pump the jack ram out to full stroke, approxi
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mately 25 mm or 1 inch.
d) Roll the jack to bring the air bleed location to the highest point.
e) Alternately open the air bleed and roll the jack back and forth. The ram return spring will keep sufficient
pressure on the fluid to purge the air.
f) After the jack has been bled of all entrapped air, tighten the air bleed securely, and replace the jack to its
original position on the calibrating machine.
6. Disassembly, Repair, and Reassembly
