Installation Instructions for Transmission/Gear Pressure SWICHGAGE®
TP-8318N
Revised 05-99
Section 05
Please read the following information before installing. A visual inspection of this product for damage during shipping is recommended before mounting.
WARNING
BEFORE BEGINNING INSTALLATION OF THIS MURPHY PRODUCT
✔Disconnect all electrical power to the machine.
✔Make sure the machine cannot operate during installation.
✔Follow all safety warnings of the machine manufacturer.
✔Read and follow all installation instructions.
CAUTION: Certain dangers to human safety and to equipment may occur if some equipment is stopped without
Base Model Description
20P, 25P, A20P and A25P SWICHGAGE®
The gage pointer makes with an adjustable contact to complete a
20PE, 25PE, A20PE and A25PE SWICHGAGE®
Features internal
20PABS, 25PABS, A20PABS and A25PABS SWICHGAGE®
Same as 20P, 25P, A20P and A25P with internal SPDT
Stainless | Diaphragm | |
Sensing Element | ||
Steel Bezel | ||
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Polycarbonate 
Lens
Pulsation
Dampener
Adjustable,(Removable)
Limit Contact
Specifications
Case Material: 20P and 25P Series: Plated steel.
A20P and A25P Series: Polycarbonate.
Pressure Connection: 1/8-27 NPT.
Contact Rating: Standard is 2A @ 30 VAC/DC resistive
Warranty
A limited warranty on materials and workmanship is given with this
FW Murphy product. A copy of the warranty may be viewed or printed by going to www.fwmurphy.com/support/warranty.htm
IMPORTANT Installation
Recommendations
SWICHGAGE® Used On Transmission/Clutch Oil Pressure
1.Install the SWICHGAGE® using a Murphy pulsation snubber PD2160 in the pressure connection at the transmission or gear and at the SWICH- GAGE®. The snubber helps reduce pressure spikes/surges which will damage the gage sensing element. It also stabilizes the gage readout
through all operating cycles. Failure to isolate gage in this manner will void Murphy warranty and possibly cause equipment damage.
2.Models with
Transmission/Gear 
PD2160
SWICHGAGE®
High Pressure Flexible Hose*
*NOTE: A length of flexible hose between the gear and the SWICHGAGE® helps dampen pressure surges.
FW Murphy
P.O. Box 470248
Tulsa, Oklahoma 74147 USA +1 918 317 4100
fax +1 918 317 4266
CONTROL SYSTEMS & SERVICES DIVISION P.O. Box 1819; Rosenberg, Texas 77471; USA +1 281 633 4500 fax +1 281 633 4588
MURPHY DE MEXICO, S.A. DE C.V.
Blvd. Antonio Rocha Cordero 300, Fracción del Aguaje San Luis Potosí, S.L.P.; México 78384
+52 444 8206264 fax +52 444 8206336 Villahermosa Office +52 993 3162117
FRANK W. MURPHY, LTD.
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K. +44 1722 410055 fax +44 1722 410088
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
+1 661 272 4700 fax +1 661 947 7570
MACQUARRIE CORPORATION 1620 Hume Highway Campbellfield, Vic 3061; Australia
+61 3 9358 5555 fax +61 3 9358 5558
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In order to consistently bring you the highest quality, full featured products, we reserve the right to change our specifications and designs at any time.
Printed in U.S.A. 113286N
Installation
