Universal Calibrang 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 34
Rev. 03/2024
6.1 Disassembly and Reassembly
The drawings provided clearly show procedures for disassembly and reassembly of the Morehouse Universal
Calibrang Machine. The parts list and drawing for the hand pump are included in this manual. Parts lists and
drawings for Universal Calibrang Machines and hydraulic jacks are supplied with the calibrang machine. This
secon includes recommendaons regarding the disassembly and reassembly of the hand pump. All numbers
in parentheses refer to items in Figure 25.
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
occurs, bleed the system of the entrapped air.
a) Check the supply of uid in the pump reservoir by removing the ll plug (30). The ll plug must be le open
about two turns during operaon to serve as a reservoir vent. If hydraulic uid must be added be sure to use
petroleum-based an-wear hydraulic uid with an ISO Viscosity Grade of 22 or 32 as recommended in Secon
3.
b) To bleed the jack, lower the ram to its full return posion. Loosen the air bleed screw for about 2 turns.
Slowly pump uid to the jack, bubbles should be seen at the screw. Do not pump to fast as to extend the jack.
c) When the bubbles stop and a steady ow of uid is observed, ghten the air bleed screw. There may be
small bubbles remaining in the jack. They may be removed by extending and retracng the jack, without
over-extension, 3 or 4 mes and repeang the bleed procedure. Removing all air is extremely dicult, but
through the use of the machine or loading near capacity and leng it sit for an hour or so, it will work its way
out.
d) Aer the jack has been bled of all entrapped air, ghten the air bleed securely.
6. Disassembly, Repair, and Reassembly
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