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 27
Rev. 11/2021
5.1 Tools
Only those tools normally available in a repair shop are needed for inspection and maintenance of the More
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house Universal Calibrating Machine.
5.2 Service Inspection
Perform a routine service inspection of the calibrating machine at regular intervals. The frequency of inspec
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tion depends on how often and under what circumstances the machine is used. During this inspection, check
the equipment for rust, leaking hydraulic fluid, and other visible signs of deterioration or damage. In addition,
check the oil level in the pump reservoir, and examine the o-ring seals. Replace any ring that is split, cut, or
otherwise damaged. After an extended period of heavy service, it is recommended to disassemble and clean
the pump. Cleaning the pump consists of washing or blowing out the body casting and washing the parts. Refer
to section 6 for disassembly instructions.
5.3 Maintenance
Routine maintenance of the machine usually is limited to replacing o-ring seals in the pump assembly, adding
hydraulic fluid (as recommended in section 3,) if required, removing rust, dirt and corrosion from all assem
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blies, touching up paint damage, tightening any nuts or set screws which have loosened, and re-leveling the
machine, if required.
The numbers in parenthesis in this section refer to items in Figure 15. If the pump and jack assembly fail to de
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velop or hold pressure, corrective maintenance may be necessary. If the hand lever is operated and the pump
fails to develop pressure, be sure the relief valve is closed and there is sufficient fluid in the reservoir. If failure
continues one or both of the check valves (33 and 38) may be leaking. Replace both o-rings to be sure.
If the pump builds up pressure but the pressure drops, examine all joints for leakage. A very small amount of
leakage will result in considerable loss of pressure. As the pressure drops, watch the hand lever. If it rises, the
discharge check valve (33) is leaking. Replace the o-ring (29). If the hand lever does not rise as the pressure
drops, then the relief valve is leaking. A foreign particle may be lodged on the seat. However, it is more likely
that the o-ring (39) has failed and must be replaced. The outlet in the pump body is tapped with 9/16”-18 NF
threads and SAE ORB-6 (15). A firm joint will prevent leakage. If leakage develops, do not tighten the fitting
excessively. Replace the o-ring seal.
5. Service, Inspection, Maintenance, & Lubrication
