NARA MOT-085 Instruction Manual

1
OPERATINGINSTRUCTIONMANUAL
FOR NARA ROTARY VANE 2 STAGE VACUUM PUMPS, MOT-085 & MOT-140
IMPORTANT: THIS UNIT HAS BEEN DRAINED FOR SHIPMENT.
DO NOT ATTEMPT TOOPERATE WITHOUT ADDINGOIL.
** Dual free voltage 110V/220V : You may select voltage by changing the switch on the rear of vacuum pump.
CAUTION : 1. Try to change only after disconnecting of Pump cord.
2. Use standard tools for this work.
3. Do not try with wet hands
In order to make the best use of your investment, familiarize yourself with the new features and operating
instructions before starting pump. With just routine care your Nara vacuum pump will give you years of reliable
service by following proper maintenance guidelines. Nara vacuum pump are designed for deep vacuum work in
refrigeration systems only.
Each Nara vacuum pump has been factory tested to guarantee 25 micron or better and listed CFM performance.
The serial number has been recorded. Complete and mail the Warranty Registration card within 10 days of
purchase to validate your warranty. You will be notified of any technical updates.
25,400 Microns = 1”
SPECIFICATION
MOT-085
MOT-140
Note
Pumping speed
50Hz
70ℓ/min, 2.5 CFM
116ℓ/min, 4 CFM
60Hz
85ℓ/min, 3 CFM
140ℓ/min, 5 CFM
Ultimate vacuum
pressure
GB. Closed
5 x 10-3 Torr
GB. Open
5 x 10-2 Torr
Motor speed
50Hz
1430 RPM
60Hz
1725 RPM
Voltage/Hz
Dual voltage 110/220V, Dual cycle 50/60Hz

2
DIMENSION
1.
Model
a
b
c
d
e
f
g
h
i
j
k
l
MOT-085
360
148
53
81
110
163
122
35
234
261
78
170
MOT-140
360
148
53
81
110
163
122
35
234
261
78
170
Unit
Explanation
A
Input
5/8-18 UNF
B
Input
7/17-20 UNF
C
Oil fill cap & Exhaust port
D
Gas Ballast
E
Oil drain cap
F
Oil sight grass
G
Handle
H
Rubber foot
I
Switch

3
OIL
Capacity
MOT-085 & MOT-140 : 660cc
Slowly add oil until oil level rises to the top of OIL LEVEL line. Replace oil fill plug.
If oil is too low, you will hear the exhaust baffle chatter. If the oil level is too high, excess oil will be
blown out the exhaust.
Pump oil should be changed after each use. If system is heavily contaminated, oil may have to be
changed several times during evacuation.
Changing oil
To reach deep vacuum, Nara vacuum pump needs clean, moisture-free oil throughout evacuation.
Care should be taken to avoid contact on skin and clothing when changing oil.
Used oil should be disposed of in a leakproof corrosive-resistant container.
1. After every evacuation while pump is warm and oil is thin place pump on level surface and
open oil drain. Oil can be forced fro the pump by opening one intake and partially blocking the
exhaust with a cloth while the pump is running. Do not operate the pump for more than 20
seconds using this method.
2. Close drain. Remove oil fill cap and fill to top of OIL LEVEL line with Nara vacuum pump oil.
Replace oil fill cap.
Flushing
If the oil is badly contaminated, flushing may be necessary. Slowly pour 1/3-1/2 cup of fresh oil
into the intake connection while pump is running. Repeat as required until contamination is removed
from oil reservoir, pump rotors, vanes and housing. Dispose of all oil used in flushing of pump.
After evacuation, oil contains rust forming water and corrosive acids. Drain immediately while pump
is warm.
MOTOR
Pump and oil must be above 30℉. Line voltage must be equal to motor nameplate ±10%.
Normal operating temperature is approximately 160℉, which is hot to the touch. Line voltage and
ambient conditions will affect this somewhat. Motor has automatic resetting thermal overload
protection. Nara vacuum pump is designed for continuous duty and will run for extended periods
without overheating.
OPERATION
IMPORTANT : DO NOT START PUMP BEFORE ADDING OIL
The following procedures will prevent oil from being drawn into cartridge and creating hart start-up.
Start-up
Open one intake port and isolation valve, close gas ballast valve and start pump. Make
vacuum connections. Crack gas ballast valve for the first part of the evacuation procedure. After
pump quiets down from initial volume of air, close valve and continue evacuating. Failure to close valve
will result in poor pump performance.
Shut-down
Close isolation valve and crack gas ballast valve. Continue running pump for 2-3 seconds. With gas
ballast valve still cracked, stop pump and then close valve. Remove hose connection and cap intakes.

4
PART LIST
No.
Part Name
MOT-085
MOT-140
800
Oil-separator
C04PH54-006A
C04PH54-006A
801
Snap-ring
I29025-0030A
I29025-0030A
802
Sight glass
G26026-001A
G26026-001A
803
O-ring
G11011-0027A
G11011-0027A
804
O-ring
G11011-0041A
G11011-0041A
805
Oil supply plug
G09032-0010A
G09032-0010A
807
Handle
C26PH54-001A
C26PH54-001A
808
O-ring
E11PH54-054A
E11PH54-054A
810
Cylinder cover-3
C02PH54-008A
C02PH54-008A
811
Hexagon f lange bolt
I20006-0055A
I20006-0056A
815
Rotor-2
C02PH54-001A
C02PH54-001A
816
Vane
C06PH54-002A
C06PH54-002A
818
Cylinder
C02PH54-003A
C02PH54-003A
819
Cylinder cover-2
C02PH54-007A
C02PH54-007A
821
Bushing
C24PH54-007A
C24PH54-007A
822
Shaft
C02PH53-012A
C02PH54-012A
824
Rotor-1
C02PH53-011A
C02PH54-011A
825
Vane-1
C06PH53-012A
C06PH54-012A
828
Cylinder-1
C02PH53-004A
C02PH54-004A
830
Cylinder cover-1
C02PH54-008A
C02PH54-008A
835
Check valve
E27PH54-001A
E27PH54-001A
836
Hexagon bolt
I20006-0005A
I20006-0005A
840
Oil-separator cover
C04PH54-006A
C04PH54-006A
841
Guard
E27PH54-004A
E27PH54-004A
842
Hexagon bolt
I20006-0010A
I20006-0010A
843
Oil-seal
G11020-0007A
G11020-0007A
844
Bushing
C26PH54-002A
C26PH54-002A
845
O-ring
G11011-0026A
G11011-0026A
846
O-ring
G11011-0022A
G11011-0022A
847
Hexagon bolt
I20006-0020A
I20006-0020A
848
Hexagon bolt
I20006-0012A
I20006-0012A
850
Flare
E26PH54-005A
E26PH54-005A
851
Check body
C26PH54-008A
C26PH54-008A
852
Gas ballast plug
E26PH54-005A
E26PH54-005A
853
O-ring
G11011-0022A
G11011-0022A
855
Coupler hub
C02PH54-003A
C02PH54-003A
856
Coupler sleeve
C11PH54-013A
C11PH54-013A
858
Stud bolt
I20010-0016A
I20010-0016A
859
Drain valve
C05PH54-017A
C05PH54-017A
860
Rubber foot
G11022-0017A
G11022-0017A
900
Motor
AMH54BC
AMH54BC
901
B-Plate
C04MH541003A
C04MH541003A
903
Switch cover
E27MH54-021A
E27MH54-021A
904
Electricity plate
E21MH54-001A
E21MH54-001A
905
Rocker switch
I21023-0009A
I21023-0009A

5
TROUBLE SHOOTING
Symptom
Cause(s)
Action
Pumpwon’tstart.
1. Power cordnot plugged in securely.
2. Motor switch not on.
3. Pump temp.below30℉.
4. Inconsistentline voltage
1. Plug powercordin securely.
2. Turn motorswitchto ON position
3. Warm up pumpto 30℉and turn
motorswitchon.
4. Line voltage mustbe within 10% of
115volt
Pumpwon’tpull deepvacuum
1. Contaminated oil.
2. Oil level too low.
3. Air leakin system being evacuated.
4. Gas ballastO-ringdirtyor cut.
5. Pump inletfittings missingornot
tightened.
1. Changeoil.
2. Add oil.
3. Locate & repairleaks.
4. Clean or replace O-ring.
5. Replace or tighten.
Oil drips from point where
shaftenters the pump
housing
Damaged oilseal.
Replace.
Pump shuts down and will not
start
Thermaloverload maybeopen
Disconnectpumpfrom system.
Wait about 15 minutes for motor to
cool and turn it on again. If it cycles off
again, return pump to factory for
repair.
Pump cycles on and off from
a completely cold start and
then runs smoothly
Oil backed up into cartridge and was
being cleared out. Pump has notbeen
shutdownproperly.
1. Remove 1/4”cap.
2. Move blank-offhandleto open
position.
3. Turn pump on.
WARRANTY
Nara vacuum pumps are warranted against defects in materials and workmanship for 1 year. All Nara
products are guaranteed when used in accordance with our directions and recommendations, and we
limit this warranty to the repair, replacement, or credit at invoice price(our option) of products which
in our opinion are defective due to defects in workmanship and/or materials. In no case will we allow
charges for labor, expense or consequential damage. Repairs performed on items out of warranty will
be invoiced on a nominal basis. Contact you wholesaler for details.
Should you need further assistance, contact Nara office.