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 16
Rev. 11/2021
3.4 Preparing the Hand Pump for Use
Before connecting the hand pump assembly to the jack, check the supply of fluid in the pump reservoir by
removing the fill plug (item 30 in Figure 15). The fill plug must be left open about two turns during operation
to serve as a reservoir vent. If hydraulic fluid must be added, then be sure to use petroleum based anti-wear
hydraulic fluid with an ISO Viscosity Grade of 22 or 32. The following hydraulic fluids are recommended, but
any equal hydraulic fluid may also be used:
Arco . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dutro AW 32
Conoco . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Super Hydraulic 32
Drydene Oil Co . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Paradene 22 AW
Exxon
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Nuto H 32
Gulf . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Harmony 32 AW
Mobil
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DTE 24
Texaco
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rando HD 32
Union. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Unax AW 150
In choosing a hydraulic fluid be certain it is equal to one of the above listed recommendations. Many formu
-
lations may lack certain additives or are formulated for special reasons, such as lower cost, high detergency,
leakage control, etc. Some of these fluids can be used successfully, however, others may prompt malfunctions
and high rates of wear.
3.5 Preparing the Jack Assembly for Use
All hydraulic jack assemblies are furnished with a self-sealing hose coupling and are fully bled and checked at
the factory prior to shipment. However, if the hand pump and hydraulic jack seem rather “spongy” during use,
then there may be air in the system. If this occurs, then the system will need to be bled of the entrapped air.
The procedure for bleeding the entrapped air is outlined in Section 6.2.