Murphy Automobile Parts LR857 User Manual

LR-7225B  
Revised 03-05  
Catalog Section 15  
(00-02-0063)  
Maintain Lube Level  
Model LR857  
Eliminates Under/OverFill Due to  
“Human Error”  
Simple Installation  
Automatically Maintains Lube Level  
Low Level Switch  
Models to Fit Varied Applications  
Positive Sealing Thumb-Valve  
**  
LR857  
Description  
Specifications  
Simplified Drawing of  
Murphy LR857 Lube Level Regulator maintains  
the crankcase oil level of an engine, pump or  
compressor. Adjusted to the correct running-oil-  
level, the LR857 will replenish oil as it is used. An  
integral, low-level switch will alarm and/or shut-  
down the equipment if supply oil is lost and the  
equipment continues to use oil.  
Inlet Connection: 5/8 in. (16 mm) I.D. hose  
Thumb-Valve Operation  
Outlet Connection: 3/8 NPT  
Thumb-Valve™  
Snap-switch: SPDT rating 10 A @ 125 VAC;  
FULL  
Oil Inlet  
0.5 A @ 125 VDC; 10 A @ 30 VDC.  
Float  
Conduit Connection: 1/2 NPT  
Case: Die cast aluminum  
Lens: Polycarbonate  
Float: Brass  
Action  
LR857  
Case  
LOW  
COM.  
N.O.  
N.C.  
Low Level  
Switch  
Application  
The LR857 maintains oil level on any size engine,  
but is recommended for small to medium volume  
applications and installations that require a 3-wire,  
snap-action switch.  
Flow Rates (see chart below):  
Oil with 0.9 specific gravity @ 70°F (21°C)  
9.73 psi  
25  
Fittings Kit: 15000420  
The 15000420 kit is sold separately. It includes  
the following items.  
20  
15  
How the LR857  
Maintains Levels  
Quantity  
Description  
As crankcase oil level drops, the LR857 float also  
drops and opens the Thumb-Valve.™ This allows  
oil to flow from the supply tank, through the  
LR857, and into the crankcase. When proper  
level is attained in the crankcase, the LR857 float  
rises, causing the Thumb-Valve to close off fur-  
ther oil flow.  
1
1/4 in. (6 mm) O.D copper cane  
10  
tube (vent connection)  
05  
1
1
1/4 in. (6 mm) tube x 1/4 male  
pipe fitting  
Flow:  
USGPM  
0
0 psi  
0
0.2500  
0.5000  
1/2 in. (13 mm) I.D. hose fitting  
(outlet connection)  
Thumb-Valve Operation  
As the equipment uses oil, the float falls, provid-  
ing immediate level compensation. At FULL  
position, the float holds the valve closed. If the  
clean oil supply is depleted and oil level contin-  
ues to fall, the low level switch will operate an  
alarm or equipment shutdown.  
Warranty  
The simple and unique Thumb-Valve is non-  
clogging and provides a positive, leak-free seal.  
Flow rate through the 1/8 inch (3 mm) orifice is  
significant to allow crankcase refill through  
the LR857.  
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  
**Products covered by this bulletin comply with EMC Council directive 89/336/EEC regarding electromagnetic compatibility except as noted.  
 

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