Crane DEMING 3906 Series Instruction manual

A Crane Co. Company
IMPORTANT! Read all instructions in this manual before operating pump.
As a result of Crane Pumps & Systems, Inc., constant product improvement program,
product changes may occur. As such Crane Pumps & Systems reserves the right to
change product without prior written notification.
420 Third Street 83 West Drive, Bramton
Piqua, Ohio 45356 Ontario, Canada L6T 2J6
Phone: [phone] Phone: [phone]
Fax: [phone] Fax: [phone]
www.cranepumps.com Form No. 119998-Rev. B
Series: 3906
DEMING
DEMING®
INSTALLATION, OPERATION & MAINTENANCE MANUAL
End-suction Centrifugal Pumps
DISCONTINUED
Parts may
NOT be available
Manual Index

2
Please Read This Before Installing Or Operating Pump.
This information is provided for SAFETY and to PREVENT
EQUIPMENT PROBLEMS. To help recognize this information,
observe the following symbols:
IMPORTANT! Warns about hazards that can result
in personal injury orIndicates factors concerned with
assembly, installation, operation, or maintenance which
could result in damage to the machine or equipment if
ignored.
CAUTION! Warns about hazards that can or will cause minor
personal injury or property damage if ignored. Used with symbols
below.
WARNING! Warns about hazards that can or will cause serious
personal injury, death, or major property damage if ignored. Used
with symbols below.
Only qualified personnel should install, operate and repair
pump. Any wiring of pumps should be performed by a qualified
electrician.
WARNING ! Toreduceriskofelectricalshock,pumpsand
control panels must be properly grounded in accordance
with the National Electric Code (NEC) or the Canadian
Electrical Code (CEC) and all applicable state, province,
local codes and ordinances. Improper grounding voids
warranty.
WARNING! To reduce risk of electrical shock, always
disconnect the pump from the power source before
handling or servicing. Lock out power and tag.
WARNING! Operation against a closed
discharge valve will cause premature bearing
and seal failure on any pump, and on end
suction and self priming pump the heat build
may cause the generation of steam with resulting dangerous
pressures. It is recommended that a high case temperature
switch or pressure relief valve be installed on the pump body.
CAUTION ! Pumps build up heat and pressure
during operation-allow time for pumps to cool
before handling or servicing.
WARNING ! Do not pump hazardous materials
(flammable, caustic, etc.) unless the pump is specifically
designed and designated to handle them.
WARNING ! Do not wear loose clothing that may
become entangled in moving parts.
WARNING ! Keep clear of suction and discharge
openings. DO NOT insert fingers in pump with power
connected.
Always wear eye protection when working on pumps.
Make sure lifting handles are securely fastened each
time before lifting. DO NOT operate pump without safety
devices in place. Always replace safety devices that
have been removed during service or repair. Secure the
pump in its operating position so it can not tip over, fall
or slide.
DO NOT exceed manufacturers recommendation for
maximum performance, as this could cause the motor
to overheat.
WARNING ! To reduce risk of electrical shock, all wiring
and junction connections should be made per the NEC
or CEC and applicable state or province and local
codes. Requirements may vary depending on usage
and location.
WARNING! Products returned must be cleaned,
sanitized, or decontaminated as necessary prior to
shipment, to insure that employees will not be exposed
to health hazards in handling said material.AllApplicable
Laws And Regulations Shall Apply.
Bronze/brass and bronze/brass fitted pumps may
contain lead levels higher than considered safe for
potable water systems. Lead is known to cause cancer
and birth defects or other reproductive harm. Various
government agencies have determined that leaded
copper alloys should not be used in potable water
applications. For non-leaded copper alloy materials of
construction, please contact factory.
Crane Pumps & Systems, Inc. is not responsible for
losses, injury, or death resulting from a failure to observe
these safety precautions, misuse or abuse of pumps or
equipment.
SAFETY FIRST!
Hazardous fluids can
cause fire or explo-
sions, burnes or death
could result.
Extremely hot - Severe
burnes can occur on contact.
Biohazard can cause
serious personal injury.
Hazardous fluids can Hazard-
ous pressure, eruptions or ex-
plosions could cause personal
injury or property damage.
Rotating machinery
Amputation or severe
laceration can result. Hazardous voltage can
shock, burn or cause death.
Other brand and product names are trademarks or registered trademarks of their respective holders.
Deming® is a registered trademark of Crane Pumps & Systems, Inc.
1996, 10/06 Alteration Rights Reserved

3
A - GENERAL INFORMATION
TO THE PURCHASER:
Congratulations! You are the owner of one of the finest
pumps on the market today. These pumps are products
engineered and manufactured of high quality components.
With years of pump building experience along with a
continuing quality assurance program combine to produce
a pump which will stand up to the toughest applications.
Check local codes and requirements before installation.
Servicing should be performed by knowledgeable pump
service contractors or authorized service stations.
RECEIVING:
Upon receiving the pump, it should be inspected for
damage or shortages. If damage has occurred, file a claim
immediately with the company that delivered the pump.
If the manual is removed from the crating, do not lose or
misplace.
STORAGE:
Short Term - Pumps are manufactured for efficient
performance following long inoperative periods in storage.
For best results, pumps can be retained in storage, as
factory assembled, in a dry atmosphere with constant
temperatures for up to six (6) months.
Long Term - Any length of time exceeding six (6) months,
but not more than twenty four (24) months. The units
should be stored in a temperature controlled area, a roofed
over walled enclosure that provides protection from the
elements (rain, snow, wind blown dust, etc..), and whose
temperature can be maintained between +40 deg. F and
+120 deg. F. Pump should be stored in its original shipping
container and before initial start up, rotate impeller by hand
to assure seal and impeller rotate freely.
SERVICE CENTERS:
For the location of the nearest Deming Service Center,
check your Deming representative or Crane Pumps &
Systems Service Department in Piqua, Ohio, telephone
[phone] or Crane Pumps & Systems Canada, Inc.,
Bramton, Ontario, [phone].
B - BEFORE YOU BEGIN
Motor driven pumps are carefully aligned on sub-base
before shipment. However, after they are placed upon the
foundation and sub-base is bolted down, the alignment
must be rechecked and in MOST CASES it will be found
necessary to carefully realign the unit. Quite often a noisy
pump is due to pump and motor not being properly aligned.
IN SUCH CASES WE DISCLAIM ALL RESPONSIBILITY
FOR PROPER WORKING OF PUMP.
Pumps are normally furnished with standard stuffing box
construction. Mechanical shaft seal can be furnished in lieu
of standard stuffing box.
The single shaft seal is used for handling clear liquids at
temperatures below their boiling point or 180°F (82°C) as
recommended by the seal manufacturer.
C - INSTALLATION
1. A good rigid foundation must be provided for pump
base.
2. Place pumping unit on foundation with bolts, of the
proper size, imbedded in the concrete. A pipe sleeve,
about 2½” diameters larger than the bolt, should be
used to allow for final positioning of the bolts. See
Figure 1. Level sub-base, to give a space of about 3/4”
for grouting, using rectangular metal blocks and shims,
or wedges having a small taper as shown in Figure 2.
3. Align the pump and motor shafts at the flexible coupling.
Hold a straight edge on the top of the coupling so that it
extends over both halves. Straight edge should rest
evenly across both rims of the coupling halves when the
straight edge is placed on the top, sides and bottom with
no light showing between the straight edge and rim of
the coupling. Also check vertical alignment of the
coupling faces with a thickness gauge. Faces must be
parallel and spaced about 1/8” apart when the motor
rotor is at its extreme position towards the pump. This
safe guards the pump shaft being crowded endwise by
the motor shaft end play. By proper adjustment of metal
shims under pump or motor, both halves of the flexible
coupling can be brought into alignment See Figure 3.
Figure 1. Foundation Bolt
Location and Anchorage

4
4. Build a dam around sub-base at least 2” high for
grouting in with thin cement and after cement has
hardened, tighten anchor bolts.
5. Recheck alignment at drive coupling.Any misalignment
now apparent should be corrected by metal shims
under pump or motor. When properly aligned, pump
shaft should turn freely by hand.
6. Afoot valve and strainer must be installed on the lower
end of the suction pipe to keep pump completely
filled with liquid when the pump is used under suction
lift conditions. Connect suction pipe to pump casing.
When a foot valve is used, it is absolutely necessary
to install a check valve in the discharge line near the
pump to prevent possible broken casing due to line
shock or surge when the pump stops. A gate valve
should also be installed in the discharge line. Connect
discharge pipe to pump casing.
It is very important that the suction and discharge pipes
“line up” naturally with the pump. DO NOT “pull” pipes
into position with flange bolts. Support pipes
independently of the pump to eliminate all strain on
the pump casing. Select discharge pipe size so velocity
is under 8 feet per second. Avoid sharp changes in
pipe sizes.
7. After pipes have been connected to pump, check
alignment at drive coupling. Correct any changes with
metal shims as in section “C”.
8. Check motor nameplate for electrical characteristics.
Be sure they are the same as the rating of the electrical
power available. Connect power lines to motor in accord
with wiring diagram on the motor and test motor
rotation, should turn in the direction indicated by arrow
cast on pump casing.
9. Fill pump (and suction pipe) with water. Close discharge
gate valve and start pump. When pump is up to speed,
slowly open the discharge valve to obtain desired
capacity and pressure.
Figure 3
PERFECT
ALIGMENT
PARALLEL
MISALIGNMENT
ANGULAR
MISALIGNMENT
Figure 2. Adjusting Wedges for Mounting

5
D - LUBRICATION
1. Pump should be lubricated with Shell Alvania #2
grease, thru grease fitting (12) before each day’s
operation.
2. The ball bearings (24) and (26) are of the shielded
type, lubricated by the manufacturer before shipment.
Under normal operating conditions no further lubrication
is required. The lubrication is satisfactory for speeds up
to and including 3600 rpm.
3. Motor bearings should also have periodic attention
and lubrication in accord with motor manufacturers’
recommendations.
4. Under ordinary conditions, a ball bearing will run from
10º to 60ºF (-12º to 16ºC) above surrounding
temperature. Unless the bearing temperature runs above
125ºF (51.6ºC), do not become alarmed.
GENERAL MAINTENANCE AND REPAIR
E - PROPER ADJUSTMENT OF IMPELLER
1. Original impeller adjustment should not be changed until
impeller is worn enough to warrant readjustment. To
reset the impeller:
Remove plug (21) and turn shaft (2) until set screws
(25) in the bearing collar line up with plug hole.
Loosen set screws with hollow head set screw
wrench. Also loosen set screws in the bearing collar
(13). Move shaft (2) toward the pump casing (1) until
impeller (2) touches casing. Move shaft away from
casing until impeller just turns freely without rubbing
casing. Tighten set screws (25) in both bearings, then
turn shaft by hand several times to be certain that it
turns freely. Replace plug (21).
F - PROPER ADJUSTMENT OF STUFFING BOX
1. The liquid being pumped should constantly, yet slowly
drip from the stuffing box gland (7) when the pump
is running. This slow drip keeps the shaft and stuffing box
packing cooled and lubricated. Tighten gland nuts (17) to
control the required drip. NEVER tighten the gland so as
to entirely stop leakage through stuffing box. It increases
the power and wears the shaft in a short time.
G - GENERAL REPAIRS
Whenever it is necessary to dismantle the pump for repairs,
it should be removed from the sub-base. Disconnect the
suction and discharge pipes and remove the four cap
screws holding pump to sub-base. Drain pump by removing
drain plug (4) in the bottom of the pump casing (1).
CLEAN AND INSPECT ALL PARTS
Extreme care should be exercised in keeping the parts
clean. Special precautions should be taken to keep ball
bearings dirt-free while in or out of the pump. The dirt will
damage the ball bearings, thus shortenting the trouble-free
service life of the pump.
Any part which is excessively worn or deteriorated should
be replaced with new parts from factory.
When ordering repairs refer to the illustrations for part
names and the pump name plate on which is stamped
the figure number, size and serial number. Without this
information we cannot identify the pump and parts in
question.
H - DISMANTLING
1. Remove casing cap screws (3) and casing (1), also take
off casing gasket (5) which must be kept moist while out
of the pump.
2. Loosen set screw in shaft coupling or pully and remove
from shaft.
3. Unscrew the cap screws (10) and nuts (17) on the
stuffing box gland (7).
4. Loosen the two set screws (25) in the bearing collar (13).
Remove plug (21) and turn shaft until set screws in
bearing (26) line up with plug hole. Loosen both set
screws.
5. Brace support head (11) and tap lightly on end of shaft
(2). Shaft and impeller (2) can now be removed as a
unit. Stuffing box gland (7), packing (8), lantern ring (9),
and packing seat washer (28), may now be removed
from the support head.
6. To remove bearings (24) and (26), remove screws (15)
and bearing cover (14). By pulling on bearing collar (13),
bearing (24) can be removed. Insert a bar into the
coupling end of the support head and push bearing (26)
toward stuffing box.
I - REASSEMBLING
1. Push ball bearing unit which consists of ball bearing
(26) and bearing collar (20) into the support head from
the stuffing box end until flush with casting
2. Insert the shaft (2) into the support head and replace
on the shaft the packing seat washer (28), lantern ring
(9), stuffing box gland (7), and slinger (6),After the shaft
is in place, push ball bearing assembly consisting of ball
bearing (24), and thrust bearing collar (13) over shaft into
position.
3. Replace bearing cover (14) and tighten machine screws
(15).

6
4. See Section “J” and Section “F” for repacking and
adjustment of stuffing box.
5. Inspect the gasket (5) between the support head (11)
and casing (1). If torn when taking pump apart, replace
with a new one. Mount casing (1) on support head and
fasten in place with cap screws (3) and nuts (22).
6. See Section “E” for impeller adjustment.
7. Replace pulley or coupling on the shaft and tighten set
screw. Replace drain plug (4) and connect suction and
discharge pipes to pump.
J - REPACKING STANDARD STUFFING
BOX
1. Remove gland cap screws (10) and nuts (17) and move
gland (7) back against slinger. With a packing puller or
wire hook, remove the old stuffing box packing (8).
2. Cut four rings of packing so that when wrapped around
the shaft, the ends touch. Tamp each ring into position,
staggering the joints about 120º apart. Turn shaft after
tamping each ring.
3. Position stuffing box gland and replace gland cap
screws (10) and nuts (17). Tighten nuts to seat packing,
then loosen until shaft can be turned easily by hand.
Force freash grease into the stuffing box thru grease
fitting (12).Adjust packing as described in Section “F”.
K - TO REPLACE MECHANICAL SEAL
.
NOTE: Seals are available as a complete assembly only.
1. Special precautions must be observed when handling
a mechanical seal. ALL seal parts MUST be kept
CLEAN. DO NOT drop seal face carbons, or floating
seats, nor scratch the lapped faces of these parts.
2. Dismantle pump as described in Section “H”, Item
numbers 1 and 2.
3. Unscrew cap screws (10) and nuts (17) from seal gland
(32).
4. Loosen the two set screws (25) in the bearing collar (13).
Also, remove plug (21) and turn shaft until set screws
(25) in bearing collar (20) line up with opening. Loosen
both set screws.
5. Brace support head (11) and tap lightly on end of shaft
(2). Shaft and impeller can now be removed as a unit.
Slinger (6), seal gland (32), seal gland gasket (29), seal
(31), and spacer sleeve (35), may now be removed from
the support head (11).
6. To remove bearings (24) and (26), remove screws (15)
and bearing cover (14). By pulling on bearing collar (13)
bearing (24) can be removed. Insert a bar into the
coupling end of the support head and push bearing (26)
towards impeller end.
7. Clean shaft thoroughly, use a light grade of emery paper
with oil to remove any scratches or burrs from the shaft
surface.
8. When replacing the seal, apply a thin coating of light
grade clean oil to the inside of the seal gland insert and
to the outside of the stationary member of the seal (31),
and press into seal gland, Wipe the face of the rotating
member of the seal to remove any dirt or grit. Next apply
a thin coating of light grade clean oil to the shaft (2) and
to the inside of the rotating seal member.
9. Push ball bearing unit, which consists of ball bearing (26)
and bearing collar (20) into support head (11) from the
seal end until flush with support head.
10. Insert shaft (2) into support head (11) and replace
on the shaft spacer sleeve (35), the seal (32), seal gland
gasket (29), seal gland (32) and slingr (6), After the
shaft is in place, push the ball bearing assembly,
consisting of the ball bearing (24) and thrust bearing
collar (13) over shaft into position.
11. Replace bearing cover (14) and machine screws (15).
12. Assemble casing (1) and gasket (5) and adjust impeller
as in Section “E”.
13. Position the shaft seal in the seal chamber by pushing
carefully on the seal gland.
14. Tighten seal gland in position.
15. Reposition slinger (6) for proper clearance.
16. Connect tubing from casing to seal chamber.
17. Replace pulley or coupling on the shaft and tighten set
screws. Replace drain plug (4) and connect suction and
discharge pipes to pump.

7
L - LOCATING TROUBLE
1. No Liquid Delivered
a. Wrong direction of rotation
b. Speed too low - Check with revolution counter
c. Discharge head is too high
d. Impeller or pipe lines plugged
e. Pump not primed
f. Suction lift too high, over 15 feet (check with
vacuum gauge)
2. Not Enough Liquid Delivered
a. Discharge head higher than anticipated
b. Speed too low (check with revolution couter)
c. Air leaks in suction pipe or stuffing box.
d. Suction lift too high, over 15 feet (check with
vacuum gauge)
e. Impeller partially plugged
f. Not enough suction head for hot water
g. Mechanical defects
1. Impeller worn or damaged
2. Casing worn
h. Foot valve too small
i. Foot valve not immersed deep enough
k. Wrong direction rotation
3. Not Enough Pressure
a. Air in water
b. Mechanical defects
c. Impeller diameter too small
d. Speed too low
4. Pump Works for a while, then Quits
a. Leaky suction line
b. Suction plugged
c. Suction lift too high, over 15 feet (check with
vacuum gauge)
d. Air or gas in liquid
5. Pump Takes Too Much Power
a. Speed too high
b. Liquid either viscous or heavier than water, or
both.
c. Strain on casing caused by piping misalignment
d. Head lower than rating
e. Mechanical defects
1. Shaft bent
2. Impeller binds in casing
3. Stuffing box packing too tightly adjusted
When ordering repairs, refer to drawing and give
information stamped on nameplate which is:
Figure Number, Pump Size and Serial Number. Unless
we have this information, we cannot identify pump and
guarantee the repairs to fit.

8
ITEM No. DESCRIPTION
1 Casing
2 Impeller with shaft and Pin
3 Cap Scres
4 Pipe Plug
5 Gasket
6 Slinger
7 Stuffing Box Gland Half
8 Stuffing Box Packing
9 Lantern Ring (Half)
10 Cap Screws
11 Support Head
12 Grease Fitting
13 THrust Bearing Collar
14 Bearing Cover
15 Self Tapping Screws
16 Shake Proof Washers
17 Hex Nuts
18 Name Plate
19 Drive Screws
20 Bearing Order
ITEM No. DESCRIPTION
21 Dust Plug
22 Hex Nuts
23 Drip Pan (with Stuffing Box only)
24 Ball Bearings
25 Set SCrews
26 Ball Bearings
27 Pipe Plug
28 Packing Seat Washer
29 Seal Gland Gasket
31 Seal
32 Seal Gland
35 Spacer Sleeve
36 Pipe Plug
37 Slinger

9
Limited 1 Year Warranty
We warrant that products of our manufacture will be free of defects in material and workmanship under normal use and
service for twelve (12) months after notice of owner’s acceptance, but no greater than twenty-four (24) months after receipt
of shipment, when installed and maintained in accordance with our instructions.
This warranty gives you specific legal rights, and there may also be other rights which vary from state to state. In the
event the product is covered by the Federal Consumer Product Warranties Law (1) the duration of any implied warranties
associated with the product by virtue of said law is limited to the same duration as stated herein, (2) this warranty is a
LIMITED WARRANTY, and (3) no claims of any nature whatsoever shall be made against us, until the ultimate consumer,
hissuccessor,or assigns,notifies us inwriting ofthe defect, anddelivers theproduct and/or defectivepart (s)freight prepaid
to our factory or nearest authorized service station. Some states do not allow limitations on how long an implied warranty
lasts, so the above limitation may not apply. THE SOLE AND EXCLUSIVE REMEDY FOR BREACH OF ANY AND ALL
WARRANTIES WITH RESPECT TOANY PRODUCT SHALLBE TO REPLACE OR REPAIR AT OUR ELECTION, F.O.B.
POINT OF MANUFACTURE OR AUTHORIZED REPAIR STATION, SUCH PRODUCTS AND/OR PARTS AS PROVEN
DEFECTIVE. THERE SHALL BE NO FURTHER LIABILITY, WHETHER BASED ON WARRANTY, NEGLIGENCE OR
OTHERWISE. Unless expressly stated otherwise, guarantees in the nature of performance specifications furnished in
addition to the foregoing material and workmanship warranties on a product manufactured by us, if any, are subject to
laboratory tests corrected for field performance. Any additional guarantees, in the nature of performance specifications
must be in writing and such writing must be signed by our authorized representative. Due to inaccuracies in field testing
if a conflict arises between the results of field testing conducted by or for user, and laboratory tests corrected for field
performance, the latter shall control. RECOMMENDATIONS FOR SPECIAL APPLICATIONS OR THOSE RESULTING
FROM SYSTEMS ANALYSES AND EVALUATIONS WE CONDUCT WILL BE BASED ON OUR BEST AVAILABLE
EXPERIENCE AND PUBLISHED INDUSTRY INFORMATION. SUCH RECOMMENDATIONS DO NOT CONSTITUTE A
WARRANTY OF SATISFACTORY PERFORMANCE AND NO SUCH WARRANTY IS GIVEN.
This warranty shall not apply when damage is caused by (a) improper installation, (b) improper voltage (c) lightning
(d) excessive sand or other abrasive material (e) scale or corrosion build-up due to excessive chemical content. Any
modification of the original equipment will also void the warranty. We will not be responsible for loss, damage or labor cost
due to interruption of service caused by defective parts. Neither will we accept charges incurred by others without our prior
written approval.
This warranty is void if our inspection reveals the product was used in a manner inconsistent with normal industry practice
and/or our specific recommendations. The purchaser is responsible for communication of all necessary information
regarding the application and use of the product. UNDER NO CIRCUMSTANCES WILL WE BE RESPONSIBLE FOR
ANY OTHER DIRECT OR CONSEQUENTIAL DAMAGES, INCLUDING BUT NOT LIMITED TO LOST PROFITS, LOST
INCOME, LABOR CHARGES, DELAYS IN PRODUCTION, IDLE PRODUCTION, WHICH DAMAGES ARE CAUSED
BY ANY DEFECTS IN MATERIAL AND\OR WORKMANSHIP AND/OR DAMAGE OR DELAYS IN SHIPMENT. THIS
WARRANTY IS EXPRESSLY IN LIEU OF ANY OTHER EXPRESS OR IMPLIED WARRANTY, INCLUDING ANY
WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
No rights extended under this warranty shall be assigned to any other person, whether by operation of law or otherwise,
without our prior written approval.
RETURNED GOODS
RETURN OF MERCHANDISE REQUIRES A “RETURNED GOODS AUTHORIZATION”.
CONTACT YOUR LOCAL CRANE PUMPS & SYSTEMS, INC. DISTRIBUTOR.
Products Returned Must Be Cleaned, Sanitized, Or Decontaminated As Necessary
Prior To Shipment, To Insure That Employees Will Not Be Exposed To Health Hazards
In Handling Said Material. All Applicable Laws And Regulations Shall Apply.

CRANE PUMPS & SYSTEMS, INC.
420 THIRD STREET
PIQUA, OHIO
45356 - U.S.A.