Cornell 6NHTA User manual

3200-300
INSTALLATION,
OPERATION AND
MAINTENANCE MANUAL
PLEASE READ CAREFULLY
YOUR WARRANTY MAY BE VOID IF
INSTRUCTIONS ARE NOT FOLLOWED
Note: when ordering parts give pump model
and serial number
Cornell Pump Co.
16261 SE 130
th
Ave; Clackamas, OR 97015 USA
Phone: [phone] Fax: [phone]

MANUAL 2815
INDEX
MODEL NN & NH W/REVERSIBLE VOLUTE
EM18DB/K W/CYCLOSEAL W/THRD SHAFT & CUTTERS
INDEX NO. DESCRIPTION
PAGE NO
1 TITLE PAGE 3200-300
2 INDEX PAGE
3 WARRANTY PAGE 50-11
4 CAUTION/WARNING PAGE 3500-2
5 PUMP SUPPORT REQUIREMENTS 3200-11
6 ASSEMBLY OF PUMP TO ENGINE 3200-12
7 STARTUP INSTRUCTIONS (WARNING/CAUTION) 3200-326
8 PARTS PAGE A18379
9 RUN-DRY SEAL INSTRUCTION & PARTS PAGE 3200-625
10 PRESSURE TESTING (WARNING/CAUTION) 3200-353
11 PUMP DISMANTLE & REASSEMBLE INSTRUCTIONS 3200-406
12 INSTALLATION, REMOVAL, AND ADJUSTMENT OF CUTTER 3200-992
13 DISMANTLING METHODS 3200-401
14 IMPELLER LOCKSCREW INSTALLATIONS (CAUTION) 3200-14
15 FRAME DISMANTLE & REASSEMBLE INSTRUCTIONS 3200-826
16 FRAME LUBRICATION INSTRUCTIONS - GREASE / OIL 3200-901/2
17 INSTRUCTIONS FOR MECHANICAL SEAL (CAUTION) 3200-632
18 PUMP TROUBLESHOOTING GUIDE 3200-380

Supersedes 3500-2
Nov, ’03 Feb, ‘05
Cornell Pump Company
CAUTION/WARNING PAGE
START-UP INSTRUCTIONS –PAGE 3200-326
CAUTION: Single port impellers (food pumps) have threaded shafts. Improper rotation will cause failure.
WARNING: Never operate electric motors or pumps without protective cover, etc. Before disconnecting any
electrical wiring, shut off the main switch, or serious personal injury may result.
CAUTION: If pumpage does not start immediately, no amount of additional pumping will solve the problem.
WARNING: Do not run pumps equipped with mechanical seal dry.
CAUTION: Do not exceed maximum recommended operating pressure for the pump. Consult factory as
WARNING: needed.
PRESSURE TESTING –PAGE 3200-353
WARNING: Failure to follow instructions on this may damage pump or cause serious personal injury.
CAUTION: Do not operate pump when at test pressure.
CAUTION: For mechanical seal only. Do not run dry.
IMPELLER LOCKSCREW INSTALLATION –PAGE 3200-14
CAUTION: Lockscrew failure can damage impeller and volute. Proper torque during installation is important.
BELT DRIVES/FLEXIBLE COUPLINGS –PAGE 3200-311
CAUTION: All rotating parts should be properly protected. Guards should be installed. Do not operate pumps
when the guards are removed.
CHOPPER IMPELLER AND CUTTER-BAR INSTRUCTIONS –PAGE 3200-355
WARNING: Chopper impellers and cutter bars have VERY SHARP edges. DO NOT place body parts in
suction spool, pump inlet, or clean-outs at any time. Wear protective gloves when working on
chopper impellers, cutter bars, and associated components.
INSTRUCTIONS FOR MECHANICAL SEAL – PAGE 3200-632
CAUTION: Do not run pump dry unless pump is equipped with Run-Dry option.
CAUTION: Once the rotating portion has been placed on the shaft, the rest of the installation must be made at
once.

Supersedes 3500-2
Nov, ’03 Feb, ‘05
Cornell Pump Company
DISMANTLING AND ASSEMBLING F18 AND EM18 CORNELL PUMP FRAMES –PAGE
3200-821
CAUTION: Never hammer the shaft or parts attached to the shaft or you will ruin both the shaft and the
bearings.
DISMANTLING AND ASSEMBLING F18DB, EM18DB, AND F18DBK –PAGE 3200-826
CAUTION: Never hammer the shaft or parts attached to the shaft or you will ruin both the shaft and the
bearings.
DISMANTLE AND REASSEMBLE A CORNELL PUMP WITH THREADED SHAFT –PAGE
3200-417
CAUTION: If the sleeve has an “O” ring it should not be heated.
DISMANTLING AND ASSEMBLING EM5/F5 AND EM5K/F5K CORNELL FRAME PUMPS –
PAGE 3200-459
CAUTION: Never hammer the shaft or parts attached to the shaft or you will ruin both the shaft and the
bearings.
DISMANTLING AND ASSEMBLING F16 AND F16K CORNELL FRAME PUMPS –PAGE
3200-810
CAUTION: Never hammer the shaft or parts attached to the shaft or you will ruin both the shaft and the
bearings.
MOUNTING PUMPS TO ENGINES –PAGE 3200-12
CAUTION: All engine driven pumps must be supported and alignment must be assured before bolting frame to
engine flywheel housing.
OPERATION OF COMPRESSORS LOCATED IN CLOSE PROXIMITY TO PUMP
WARNING: Do not allow compressed air to pressurize the pump or vent-off compressed air through the pump
as this may damage pump or cause serious personal injury.

NEW PAGE 3200-
11
September, 1998
Cornell Pump Co.
PUMP SUPPORT REQUIREMENTS
Piping must be properly
supported. Pump is not intended to
carry piping loads.
Support plate for 4WB, 5WB, 3YB & 4YB
Support plate for
all other models.
This pump is equipped with a support plate which is to be used by the customer to provide vertical
support for the pump. If desired, the customer may provide his own support and discard the support
provided. In either case, the pump must be supported.
NOTE: USE PUMP END FRAME BOLT SLOTS FOR SUPPORT ON EMS.
FAILURE TO PROVIDE PROPER SUPPORT OF THE PUMP
WILL VOID THE WARRANTY.

NEW PAGE 3200-12
March, 1992
Cornell Pump Company
Page 1 of 2
Assembly of Cornell Pumps to Engines
Frame Models EM16, EM18, EM18DB
1. There are three items to consider –the pump and pump bracket as a
unit, the engine, and the gear ring. The SAE housing fit on the engine
determines the size pump bracket to be furnished. The machining and
drilling on the flywheel determines the size gear ring furnished (the
gear ring can best be determined by knowing the size of clutch that
would fit, or by ordering the flywheel for the gear ring you need).
There are a few engine models that are exceptions. A segment has to
be cut out of the adapter ring on the pump bracket in order to clear the
starter. The dimension from the outer surface of the housing to the
flywheel varies on different engines. The pump shaft is made for the
greatest depth so as to be adaptable to all sizes. In some cases it will
be necessary to remove the drive hub and shorten the pump shaft, or
occasionally the drive hub will have to be shortened.
Some models and sizes use fiber drive gears, others use a rubber disc
drive. The above procedure applies to both systems.

NEW PAGE 3200-12
March, 1992
Cornell Pump Company
Page 2 of 2
Assembly of Cornell Pumps to Engines
Frame Models EM16, EM18, EM18DB
Cornell manufactures all engine-frame to fit the standard SAE-type flywheel and housing. For engines that do not have standard SAE
flywheels and housings, some alterations may be required.
There are two types of drive and ring gear packages which are furnished with these units: Fiber drive and rubber disc drive. In either
case, the following instructions apply:
Assembly Instructions
1. Set the ring gear in place in the flywheel and bolt securely in place (see chart below for bolt requirements).
2. Remove rubber deflector on the drive end shaft and discard before installing drive gear.
3. Place the drive gear on the pump shaft. Secure the drive gear to the pump shaft. Some drive gears are supplied with a
tapered locking-type bushing. It is important that the bolts are torqued to the recommendation supplied with the bushing.
With block and tackle or hoist, maneuver unit into place on engine, being careful to mesh the drive gear in the ring gear
properly. -- CAUTION --
4. All engine-driven pumps must be supported, and alignment must be assured before bolting frame to the engine flywheel
housings.
5. Bolt the pump and frame securely to engine flywheel housing and support. Double check the location of the drive gear
in the ring gear and adjust if necessary (see chart below for bolt requirements).
Flywheel Housing and Ring Gear Bolt Requirements
SAE # Bolt Size Bolt Grade (SAE) Bolt Torque # of Bolts
17/16 -14 550 Ft-lbs. 12
2, 3, 4 3/8 -16 530 Ft-lbs. 12
Clutch Size Bolt Size Bolt Grade (SAE) Bolt Torque # of Bolts
6.5, 7.5 5/16 -18 517 Ft-lbs6, 8
8, 10, 11.5 3/8 -16 530 Ft-lbs 6, 8, 8
14 1/2-13 575 Ft-lbs 8
Taper Lock Bushing Instructions
Insert bushing in hub. Match holes Take the screws out entirely, insert
(not threads) and slip entire unit onto them into the holes which are
shaft. Put screws into the holes that threaded in the bushing only, using
are threaded in hub only. Align the them as jackscrews. This disengages
product and tighten screws. As the bushing. Its grip is “unlocked,”
bushing is wedged inward, it contracts permitting quick, easy removal of
–evenly –and grips the shaft. product. Note: For complete
instructions, refer to instruction sheet
packaged with each bushing.
Torsional Vibration
A torsional vibration analysis is the responsibility of the packager. Engine manufacturers or specialized consulting offices can provide
this service. Cornell does not assume responsibility of torsional vibration problems of pump-engine units assembled by others (ISO
3046/V 1978(E) 4.1.1 and .2). Problems due to torsional vibration are not warrantable.
REMOVE
INSTALL

Supersedes 3200-326
Sep., 2015 Mar., 2016
Cornell Pump Company
Startup Checklist
BEFORE THE STARTUP OF ANY PUMP, A CAREFUL CHECK MUST BE MADE TO ENSURE THAT ALL IS IN ORDER
1. Reread all instructions and check for compliance on each point.
2. Make sure:
a. All fasteners at gasketed surfaces are properly tightened.
b. Belts and couplings (shaft) are properly adjusted, aligned, and guards are in place.
c. All thrust blocks and supports are adequate.
d. The pump and/or baseplate is bolted securely to a solid foundation. There must be no piping loads
on the pump casing, support suction or discharge piping, and piping must be clean and free of debris
and obstruction, gaskets in place and all joints secure.
e. That all electrical connections and electrical equipment are installed by a qualified and
licensed electrical contractor.
f. The pump rotates freely by hand. Then check the pump rotational direction with very
short on/off power pulses on the starter switch.
g. Pumps with cutting mechanism or axial adjusted wear plates should be checked for
proper axial clearances. This includes MP and SP slurry pumps, cutter pumps, ST self-
primers, and chopper pumps product lines. See section in manual pertaining to wear plate or cutter
adjustment for proper clearance for adjustment and procedure.
h. Pumps with mechanical seal must not run dry unless equipped with the run-dry feature.
CAUTION
Some pumps are equipped with threaded shafts (Food pumps, etc.). Improper rotation will cause
failure and costly repairs. If you are unsure if your pump has a threaded shaft, contact factory.
Pumps with mechanical seal must not run dry unless equipped with run-dry option.
3. Check the valves for proper position. If the system has a discharge gate valve, start with valve closed.
The speed of opening depends upon the size and length of your discharge pipe and capacity of the pump.
The valve should not be more than .25" open until the line is filled. The purpose of this procedure is to
reduce the possibility of a water hammer or shock if filling is too rapid.
4. For Stuffing Box with Packing
When first starting the pump, there should be a leakage. If the packing is too loose, air will suck in
around the packing and the pump will not prime. After the pump is primed, back off on packing gland
nuts to free leakage. Several minutes later, gradually and evenly tighten packing gland nuts until
leakage is reduced to a trickle. Do not attempt to shut off all the leakage.
For Stuffing Box with Mechanical Seal
Read and comply with all seal instructions within manual. During shipment a seal may be jolted, which
could cause leakage. However, any leak should stop after a brief period of operation.

Supersedes 3200-326
Sep., 2015 Mar., 2016
Cornell Pump Company
5. Instructions For Pumps with Balance Line and Wear Rings
Wear rings and balance lines are vital for a successful pump operation. They perform two important
functions. First, they reduce the pressure at the stuffing box. Second, they reduce axial thrust loads.
Wear rings should be replaced if the clearance has increased to about .03" per side. Balance lines should
be kept free of obstructions and they should be replaced if they are pinched, bent, or corroded.
6. Motors
Check the power supply voltage, amperage, temperature and RPM with the motor nameplate. Review
item 2F with respect to rotation.
NOTE: Large motors must not be started and stopped more than five times per hour.
CAUTION
Whether placed inside our outside, the motor should be mounted on a base four to six inches
higher than surrounding floor level.
7. Cornell Bearing Frames
In general, the considerations for a bearing frame are the same for that of electric motors.
NOTE: If a frame is oil lubed (denoted by ‘K’ on serial number plate and sight gauge on the side of the
frame), put appropriate oil in per lubrication instructions. Make sure support systems are in place and
working such as special lubricants, seal water, etc.
If the pump is used in winter, provisions must be made for protection of the pump and piping from
freezing. Add a heater if necessary. If the pump is not used in the winter, the volute should be drained to
prevent damage.
WARNING
Never operate electric motors or pump equipment without all protective covers, screens and
guards properly in place. Before disconnecting any electrical wiring, shut off the main
switch and lock it out.
8. Check to make sure the screens are in place. A screen or strainer should have a free opening at least
three times the area of the suction pipe.
9. Bump start the driver and check for proper rotation. Improper rotation can be harmful to persons and
equipment.
10. Start the driver. If pump is primed or filled with liquid, the pumping will start immediately.
Cornell Centrifugal Pump Priming
A centrifugal pump is primed when all the internal passages of the pump are filled with the liquid to be
pumped. Do not operate any pump without being properly primed unless it has been specifically
designed for such operation.
When the pump is primed and the unit is started, the pumpage will start to flow immediately. If it does
not, recheck the system for complete prime and possible air leaks. Correct the deficiencies and restart.

Supersedes 3200-326
Sep., 2015 Mar., 2016
Cornell Pump Company
CAUTION
If the pumpage does not start immediately, no amount of additional pumping will solve the
problem.
WARNING
Do not allow compressed air to pressurize the pump or vent-off compressed air through
the pump as this may damage pump or cause serious personal injury.