LM-92164N
Revised 10-03
Section 15
Installation Instructions for Level Maintainers
(00-02-0176)
Model Series LM300
Read the following instructions before installing. A visual inspection of this product for
damage during shipping is recommended before mounting. These installation instructions are
intended for all LM300 series models.
GENERAL INFORMATION
LM301-EX
Shown with optional hose kit fittings
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.
**
Patent
5493086
LM300: Level Maintainer only (no switches).
LM301: Low switch contacts for low level shutdown or
alarm. Four wires, SPDT.
Outlet Connection: 3/4-14 NPT left side, right side, and bottom.
LM302: Two switches for low and high level shutdown or alarm. Four wires,
DPST, wired N.O. in normal operating ranges.
Crankcase Balance Vent Fitting: 1/2-14 NPT.
Mounting: Accepts Murphy pipe mounting or universal mounting brackets.
LM303: Two switches for low and high level shutdown or alarm. Four wires,
DPST, wired N.C. in normal operating ranges.
Lens: Clear “Frog Eye” non-staining, high impact, high temperature nylon; UV
and heat stabilized.
LM304: Two switches. Alarm before shutdown on low level and shutdown on
low-low level. Four wires, DPST, wired N.O. in normal operating ranges.
Dial: High visibility white background with green and white “index” lines for
normal level indication.
LM305: Two switches. Alarm before shutdown on low level and shutdown on low-
low level. Four wires, DPST, wired N.C. in normal operating ranges.
Test Knob: Rotate to test switch operation. Turn clockwise for low level test
and turn counterclockwise for high level test.
Specifications
Flow Rate Test: Using SAE 30 @ 32°F (0°C).
Case/Cover: Die cast aluminum.
Orifice
Flow Rates
Switch Housing: Aluminum.
Pressure
Diameter
††
Approval Rating: LM301 thru LM305 : CSA certified for non hazardous
locations. Enclosure Type 4 certified.
LM301-EX thru LM305-EX: CSA certified for Class I, Groups C and D;
Class II, Groups F and G hazardous locations. Enclosure Type 4 certified.
4.7 GPH - 31.0 GPH
(17.8 LPH - 117.3 LPH)
4 ft. oil – 15 ft. oil
(1.2 m oil – 4.6 m oil)
1/4 in.
*
(6 mm)
††
10 psig – 30 psig
(68.9 kPa – 207 kPa)
[.69 – 2.07 bar]
1/8 in.
(3 mm)
16.9 GPH - 32.1 GPH
(63.7 LPH - 121.5 LPH)
Float: Rigid polyurethane foam. Polyurethane coated.
Maximum Ambient Temperature: 250°F (121°C)
Standard
*
Oil Inlet Connection: Top entry 1/2-14 NPT with built-in filter screen (removable
for cleaning).
NOTE: Friction losses due to piping NOT considered.
Inlet Orifices: 1/4 in. (6 mm) standard. 1/8 in. (3 mm) available.
Optional Hose Kit: 15000355
Quantity Description
2
Wire (switch models): 18 AWG x 13 in. (1.0 mm x 330 mm).
Maximum Inlet Pressure (MIP):
Max. Differential: 2 in. (51 mm) between running and stationary oil level.
30 psi (207 kPa) [2.07 bar].
with 1/8 in. (3 mm) orifice.
15 ft. oil (4.6 m oil)
1
1
1/2 in. (13 mm) I.D. x
3 ft. (914 mm) long hose
1 in. (25 mm) I.D. x
3 ft. (914 mm) long hose
with 1/4 in. (6 mm) orifice.
2
2
2
2
1/2 in. (13 mm) worm gear clamp
1 in. (25 mm) worm gear clamp
Maximum Case Pressure (MCP): 15 psi (103 kPa) [1.03 bar].
†
Orifice Seal : Buna-N Thumb-Valve™
1/2 NPT x 1/2 in. (13 mm) barbed fitting
3/4 NPT x 1 in. (25 mm) barbed fitting
Switch Contact: Silver, SPDT snap acting, 10A @ 125, 250VAC; 10A @ 30VDC.
(1 only for low level; 2 only for high & low; or 2 only for low with alarm before shutdown)
††
CSA certified with switch contacts rated at 10 A @ 250 VAC (standard).
** Products covered by this bulletin comply with EMC Council directive
89/336/EEC regarding electromagnetic compatibility except as noted.
LM-92164N page 1 of 4
TYPICAL INSTALLATION continued
4. Fill the crankcase to the proper oil levels. With the engine running and
Crankcase (Oil Pan) Mounting
warm, loosen the mounting bracket adjustment bolts and adjust the
LM300 so that the oil level in the sight gauge is aligned with the white
“index line” on the dial (Figure 4). Tighten the adjustment bolts securely.
1. Install the universal bracket to the crankcase using the existing
crankcase bolts (Figure 3A). Crankcase bolt diameter must be no larger
than 7/16 inch (11 mm).
Connecting the LM300 to an Oil Supply Tank
(level maintaining models only)
1. Remove the caplug from the oil inlet connection. Be sure the filter, inside
Crankcase
Bolt
Universal
Bracket
the connection, is clear of debris. Install the oil inlet connection.
2. Connect a 1/2 inch I.D. (13 mm) or larger hose
to oil inlet fitting on the LM300 and to the shutoff
valve on the oil supply tank. See Figure 5. For
Crankcase
Oil Supply
Tank
Note Clearance
before mounting
Adjustment
Bolt
models LM300 thru LM305 recommended
minimum mounting of the oil supply
Oil Inlet
tank above the LM is 4 ft. (1.2m);
Hose
maximum 15 ft. (4.6m). The
Figure 3B
Figure 3A
hose must maintain a
NOTE: Check clearance between crankcase and mounting bracket
before installing the mounting bracket. If space between the crankcase
and mounting bracket does not allow installation and access to the
adjustment bolts advance to Step 3.
downward slope and not have
low spots or droops.
Maximum head pressure
rating using standard 1/4 in. (6
mm) orifice is 15 ft. (4.6
meters). See Flow Rate test on
page 1 for additional orifice pressure
2. Mount the LM300 to the universal bracket using two 3/8-16 UNC x 1
inch bolts supplied. DO NOT tighten the adjustment bolts too tight. You
will have to adjust the LM300 later in the installation process.
ratings.
3. If space between the crankcase and mounting bracket is narrow, install
the universal mounting bracket to the LM300 before installing to the
crankcase oil pan.
Figure 5
3. Before filling the supply tank with
oil, be sure the tank is clean and dry andthe shutoff valve is closed.
Also, be sure all hoses and clamps are tight. Fill the tank with CLEAN
oil.
Connecting Fittings and Hoses
The following instructions are for all LM300 series level maintainers.
All steps that reference oil inlet or oil supply tank DO NOT apply to
non-level-maintaining models. Also, these instructions are based on the
Murphy optional hose kit described on page 1. If you did not order the
optional hose kit, gather the hoses, clamps and fittings as specified in
the optional hose kit.
WARNING:Overfill condition can be caused by excessive
inlet pressure, (maximum inlet pressure depends on orifice),
and/or improper “vent to crankcase” installation.
See Flow Rate Test on page 1 for maximum pressure.
4. After oil supply tank is full, open the shutoff valve.
1. Install the LM300 fittings in their proper locations. NOTE: Apply a
sealant such as teflon, to all threaded connections.
2. Attach the 1 inch (25 mm) diameter, flexible monitoring hose to the
crankcase and the monitoring port on the LM300. See Figure 4.
CAUTION: The hose must slope slightly downward from the LM300
and MUST NOT have any droop or low spots.
Next, make the proper electrical connections for the application. See
contact ratings on page 1 and schematics on page 4.
Switch Test (switch models only)
To test the shutdown and/or alarm functions
perform the following:
NOTE: If the drain plug on the crankcase
is used for the connection, we
1. Unscrew protective boot from test knob.
IMPORTANT: Always replace boot after
testing.
recommend installation of a tee to
allow draining of the crankcase
for service.
Oil Inlet
Hose
Vent
Hose
2. Turn the test knob 1/4 turn to the right
(clockwise), for low test indication (Figure 6).
Viewing
Lens
Running
Engine
Crankcase
3. Install the 1/2 inch (13 mm)
I.D. x 3 ft. (914 mm) hose to
the vent connection on the
LM300 to the vent connection
on the crankcase. See Figure 4.
The vent connection on the
Figure 6
3. Turn the knob 1/4 turn to the left
(counterclockwise), for high test indication. DO NOT FORCE
THE TEST KNOB TO TURN.
Oil Level
NOTE: After the engine shuts down, you will notice that the oil in the
sight gauge glass will rise above normal running level, possibly
showing an overfill condition. This is a result of “drain-back” to the
engine crankcase and it is normal. Therefore, on models LM302 and
LM303 it may be necessary to wire the high level shutdowns into a
class “B” or “C” (bypass until first time safe) lockout, so as to allow a
permissive start. After the engine is re-started the level will pull down
to the normal running level and the shutdown features will be active. A
modulating valve (Thumb-Valve™) in the level maintaining models
will allow oil usage to be made-up continuously during operation.
Monitoring Hose
crankcase must be well above the
regulated oil level. All hoses must
be clear of obstructions.
Figure 4
BEFORE CONTINUING, VERIFY THAT ALL HOSE CLAMPS
ARE TIGHT.
LM-92164N page 3 of 4
SWITCH WIRING DIAGRAMS
WARNING:DISCONNECT ALL ELECTRICAL POWER BEFORE CONNECTING ANY WIRES.
LM305
Alarm before
shutdown N.C.
DPST
LM301
LM302
High/Low N.O.
DPST
LM303
High/Low N.C.
DPST
LM304
Alarm before
shutdown N.O.
DPST
SPDT
Green
Black
Green
Black
Green
Green
Green
Brown
Normal
Low
High
High
Normal
Normal
Low
Yellow
Normal
Low
Normal
Red
Brown
Black
Low-Low
Low-Low
Low
Low
High
Normal
High
Normal
Low
Float
Yellow
Blue
Blue
Yellow
Orange
Normal Orange
Normal
Low
Red
Red
Low
Low-Low
Low
Low-Low
Float
Float
Float
Float
OPERATING RANGES OF SWITCHES
This section applies only to models that have built-in switches. The illustrations
below and to the right show the dials and their operating ranges of the switches.
If levels are within the designated zones the switch(es) will activate. Notice that
a switch is capable of activating approximately 3/8 in. (10 mm) from the top of
the high zone and 3/8 in. (10 mm) from the bottom of the low zone. The dial in
Figure 9 shows that if level continues to drop into the low-low zone, a
shutdown will occur.
3/8 in.
(10 mm)
High Zone
3/4 in.
Shutdown or Alarm
(19 mm)
Normal
Operating Range
3/4 in.
(19 mm)
Low Zone
Shutdown or Alarm
NOTE: Color zones on dial face show approximate normal operating zones.
Actual conditions may vary depending upon operating characteristics of the
engine. Placement of the LM300 according to the above instructions will
compensate for these conditions.
3/8 in.
(10 mm)
Figure 8: LM302/LM303
Normal
Normal
Operating Range
Operating Range
3/4 in.
(19 mm)
3/4 in.
(19 mm)
Low Zone Alarm
Low-Low Zone Shutdown
Low Zone
Shutdown or Alarm
3/8 in.
1/4 in.
3/8 in.
(10 mm)
(10 mm) (6 mm)
Figure 7: LM301
Figure 9: LM304/LM305
Warranty
A limited warranty on materials and workmanship is given with this FW Murphy product.
CONTROL SYSTEMS & SERVICES DIVISION
P.O. Box 1819; Rosenberg, Texas 77471; USA
+1 281 633 4500 fax +1 281 633 4588
e-mail [email protected]
FRANK W. MURPHY, LTD.
MACQUARRIE CORPORATION
1620 Hume Highway
Church Rd.; Laverstock, Salisbury SP1 1QZ; U.K.
+44 1722 410055 fax +44 1722 410088
e-mail [email protected]
Campbellfield, Vic 3061; Australia
+61 3 9358 5555 fax +61 3 9358 5558
e-mail [email protected]
FW Murphy
P.O. Box 470248
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
e-mail [email protected]
MURPHY SWITCH OF CALIFORNIA
41343 12th Street West
Palmdale, California 93551-1442; USA
+1 661 272 4700 fax +1 661 947 7570
e-mail [email protected]
Tulsa, Oklahoma 74147 USA
+1 918 317 4100
fax +1 918 317 4266
e-mail [email protected]
USA–ISO 9001:2000 FM 28221
UK–ISO 9001:2000 FM 29422
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.
LM-92164N page 4 of 4
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