Sherwood 18000 Series Quick start guide

The Original Engine Cooling Pump Since 1921
www.sherwoodpumps.com
18000 Pump Series Technical Guide
Identification
G1801 and G1805 G1807 and G18071-01 G1804, G1806 and G18061-01
G1808 and G18081-01 G1810

1
The following assembly/disassembly procedures apply to all 18000 Series pumps. Deviations from pump to pump are primarily a
result of different methods of drive and mounting. Pump numbers can be found stamped into the cover plate of the pump.
Disassembly:
A. Remove the bolts (1) and lockwashers (2) from the cover (3).
B. Remove the cover, quad rings (4), impeller (5), cam liner halves (6), and wearplate (7). Note the direction of the impeller blades
to ensure proper replacement of the impeller during the assembly procedure. Caution: the pin (8) might fall out from its place
between the cam liner halves.
C. Using external snap ring pliers, remove the retaining ring (9) from the shaft.
D. Slide the washer (10) and mechanical seal (11) off of the shaft.
E. Remove the bolts (12) holding the body (13) to the housing (14).
F. Slide the housing off of the shaft and body assembly.
G. Press the seal seat (15) out of the housing.
H. When applicable remove the drive gear assembly: while supporting the drive gear (16), remove the nut (17), nut washer (18),
and key (19) from the shaft. Slide the gear off of the shaft and remove the thrust washer (20) behind the gear.
I. Using internal snap ring pliers, remove the retaining ring (21) from the body. Remove the bearing shield (24) from the body.
J. Press the bearing and shaft assembly (22) out of the body.
K. Remove the lip seal (23) and washer (25) from the body.
L. Inspect the shaft for grooving of the lip seal area and heavy fretting of the spline portion that drives the impeller. Inspect the
bearings for loss of grease, corrosion, and rough rotation. If the shaft or bearings exhibit such a wear, replace the entire shaft
and bearing assembly (22) listed on page 3.
Warning: Do not try to build the shaft and bearing assembly from the individual parts, but instead purchase the entire shaft and
bearing assembly listed below. Due to extremely tight tolerances, special assembly procedures for this assembly must be followed
to prevent galling of the shaft in the lip seal area.
Assembly:
A. Replace the washer (25) then press the lip seal (23) into the pump body (13) with the metal backing ring of the lip seal toward
the housing (14) and away from the engine. Care should be taken to insure proper alignment of the lip seal to the pump body
and that the lip seal is uniformly pressed to prevent distortion.
B. Press the shaft and bearing assembly (22) into the pump body.
C. Slide the bearing shield (24) into the pump body and against the inner bearing.
D. Using internal snap ring pliers, install the retaining ring (21) into the body.
Assembly / Disassembly Instructions
15
11
13
22
19
16
21
17 20
18
10 9
7
4
865
32
1
14
12
24/25
23

2
Assembly / Disassembly Instructions (continued)
E. Press the mechanical seal seat (15) into the housing with the white ceramic seal face or gray silicon carbide face toward the
impeller. Lubricate the outside of the seat boot with a water soluble lubricant or soapy water for easier assembly. Oil or grease
must not be used as it will prevent the rubber cup assembly from properly gripping the housing. The seat should be inspected
to ensue that the cup did not become partially dislodged during the assembly procedure.
F. Slide the housing over the shaft and body assembly. Fasten the three bolts (12) and torque them to 25 ft-lbs.
G. When applicable replace the drive gear assembly. Slide the thrust washer (20) onto the outer bearing. Place the key (19) in the
shaft, then slide the gear (16) on the shaft. Replace the washer (18) then tighten the nut (17) onto the shaft. While supporting
the drive gear, torque the nut to 270 ft-lbs.
H. Lubricate the inter rubber portion of the mechanical seal (11) with a water soluble lubricant or soapy water and slide the seal
onto the shaft, with the carbon or silicon carbide portion of the mechanical seal toward the seal seat. Oil or grease must not be
used as it will prevent the mechanical seal from properly gripping the shaft.
I. Place the washer (10) onto the shaft and against the mechanical seal (see below to identify the proper washer) and then using
external snap ring pliers, install the retaining ring (9) into the groove in the shaft to compress the mechanical seal.
Seal Washer Selection
When replacing the mechanical seal, it is necessary to ensure the proper seal washer is used to avoid damage to the pump. It is
recommended that all pumps be upgraded with the silicon carbide mechanical seal 23837, except for pump number G1810, which
can only be fitted with the 23512 seal. Use the following to determine which washer to use:
• When using the silicon carbide mechanical seal 23837 for replacement, determine the proper spacer to use from the chart
below. Silicon carbide is characterized by the charcoal gray colored seal and seat faces, as opposed to carbon on ceramic,
which would be black on white.
• Exceptions to the chart
oIf the pump is to be fitted with the new shaft and bearing assembly listed on the chart on page 3 (24000, 24001, 24002,
and 24003), use the 19866 washer. These shaft and bearing assemblies can only be used with the 23837 silicon
carbide mechanical seals.
oReplacement of the seal with the carbon on ceramic mechanical seal 19878 can only be performed on older units with
the original shaft and bearing assemblies still in place. Use the 19866 spacer in such cases. Use of the 19878 seal with
the current production units (G18061-01, G18071-01, and G18081-01) or with older units fitted with the new shaft and
bearing assemblies will cause damage to the pump.
Pump Number 23837 Seal
Spacer Number *
G1801 23840
G1804 23840
G1805 23840
G1806 23840
G18061-01 19866
G1807 23840
G18071-01 19866
G1808 23840
G18081-01 19866
G1810 N/A
* Note: the 19866 spacer is .060" thick and the 23840 is .260" thick.
J. Install the wearplate (7) with the hole in the plate lined up with the slot in the housing. Install the quad ring (4) into the housing
and on top of the wearplate.
K. Create the cam assembly by connecting the cam halves (6) together and installing the pin (8) into the cam liner. A dab of
grease can be used to hold the pin in place during installation. Place the cam assembly into the housing, ensuring that the pin
aligns with the slot in the housing.
L. Insert the impeller (5) in the housing using a twisting motion. Ensure that the impeller blades are bent in the same direction as
upon removal (dependent on the pump model – see illustration on page 3 for details). For ease of installation apply a silicon
lubricant to the impeller. Caution: DO NOT USE A PETROLEUM BASED LUBRICANT (petroleum product will cause damage
to the impeller).
Note: if the pump is fitted with a silicon carbide seal,
it must be replaced with the 23837 silicon carbide
seal to prevent damage.

3
Preventative Maintenance
Vanes flipped to the left Vanes flipped to the right
(viewed from cover). (viewed from cover).
Models: G1808, G18081-01 and G1810 Models: G1801, G1804, G1805, G1806,
G18061-01, G1807, and G18071-01
M. Insert the remaining quad ring (4) into the groove, install the cover (3) on the housing, and then fasten the
lockwashers (2) and bolts (1) to 8 ft-lbs torque.
Assembly / Disassembly Instructions (continued)
* When using these Shaft and Bearing Assemblies, replace the seal with the silicon carbide mechanical seal 23837 only. Use of the
19878 mechanical seal with these Shaft and Baring Assemblies may cause pump damage. See “Seal Washer Selection” on page 2.
Sherwood # G1801 G1804 G1805 G1806 G18061-01 G1807 G18071-01 G1808 G18081-01 G1810
ITEM QTY
1 Cap Screw 5 19626 19626 19626 19626 19626 19626 19626 19626 19626 19626
2 Lockwasher 5 15944 15944 15944 15944 15944 15944 15944 15944 15944 15944
3 Cover Plate 1 19837 19837 19837 19837 19837 19837 19837 19837 19837 19837
4 Quad Rings 2 19879 21561 21561 21561 21561 21561 21561 21561 21561 21561
5 Impeller 1 18000 18000 18000 18000 18000 18000 18000 18000 18000 18000
6 Cam Liner Halves 2 19829 21533 21106 21533 21533 21106 21106 21533 21533 21106
7 Wear Plate 1 19836 19836 19836 19836 19836 19836 19836 19836 19836 19836
8 Pin 1 21566 21566 21566 21566 21566 21566 21566 21566 21566
9 Retaining Ring 2 19762 19762 19762 19762 19762 19762 19762 19762 19762 19762
10 Washer 1 19866 19866 19866 19866 19866 19866 19866 19866 19866 19866
11/15 Mechanical Seal Assy 1 19878 19878 19878 19878 23837 19878 23837 19878 23837 23512
12 Bolt 3 21172 21172 21172 21172 21172 21172 21172 21172 21172 21172
13 Body 1 19827 21476 21920 21986 21986 21827 21827 22412 22412 23396
14 Housing 1 19828 21565 21829 21829 21829 21829 21829 22762 22762 23523
16 Gear 1 22789 22789
17 Nut 1 22790 22790
18 Washer 1 22788 22788
19 Key 1 22791 22791
20 Thrust Washer 1 22779 22779
21 Retaining Ring 1 19867 19867 19867 19867 19867 19867 19867 19867 19867 19867
22 Shaft and Bearing Assy* 1 24000 24001 24000 24001 24001 24001 24001 24002 24002 24003
23 Lip Seal 1 19869 19869 19869 19869 19869 19869 19869 23045 23045 19869
24 Bearing Shield 1 23425
25 Washer 1 19835 19835 19835 19835 19835 19835 19835 19835 19835
Minor Repair Kit 24004 24023 24004 24004 24023 24023 24004 24004 24005
Major Repair Kit 24006 24024 24006 24006 24024 24024 24007 24007 24008

4
18000 Impeller & Impeller Puller
The new patented 18000 impeller with threaded insert makes replacement easy when using the
new inexpensive Sherwood Impeller Puller (Model #23631).
Removal
• Remove the cover
• Insert the Sherwood puller into the threaded insert
• Screw the puller against the shaft lifting the impeller until
loose
• Twist and pull the impeller out of the pump
Installation
• Apply a non-petroleum based lubricant to impeller (i.e. silicon
or soapy water)
• Install the impeller with a twisting motion onto the shaft
• Option: Used puller tool to push impeller into pump by
loosening and lowering nut until tightens against impeller
insert, then turning for installation
• Then use a small amount of non-petroleum based lubricant
to help hold the o-ring in place while replacing the cover
Use the same puller (#23631) for the new 17000 impeller
as well.
Impeller Removal

5
Preventative Maintenance
Pleasure Boating Commercial/Fishing Use
Maintenance (Low Hours) (High Hours)
Schedule Light Duty Severe Duty Heavy Duty Severe Duty
(High RPM, Silt or Sand) (High RPM, Silt or Sand)
Impeller Kit Every year 6 months 6 months 3 months
Minor Kit 2 years Every year Every year 6 months
Major Kit 4 years 2 years 2 years Every year
Impeller Kit Minor Kit Minor Kit Minor Kit
18000K 24004 24023 24005
1-18000 Impeller 1-18000 Impeller 1-18000 Impeller 1-18000 Impeller
1-19879 O-ring 2-21561 Quad Ring 2-21561 Quad Ring 2-21561 Quad Ring
1-21561 Quad Ring 1-23837 Seal Assy 1-23837 Seal Assy 1-23512 Seal Assy
1-23631 Puller 1-19762 Snap Ring 1-19762 Snap Ring 1-19762 Snap Ring
1-21566 Pin 1-21566 Pin 1-21566 Pin
1-19866 Washer 1-19866 Washer 1-19866 Washer
1-23840 Spacer 1-23840 Spacer 2-21106 Cam Liners
2-21533 Cam Liners 2-21106 Cam Liners
G1801 X
G1804 X X
G1805 X X
G1806 X X
G18061-01 X X
G1807 X X
G18071-01 X X
G1808 X X
G18081-01 X X
G1810 X X
Note: New 23837 silicon carbide mechanical seal – Superior abrasion resistance and longer life. Standard in kits
shown above. 23837 is a direct upgrade of the 19878 mechanical seal (see “seal washer section” on page 2
to determine the proper spacer needed.)
The #1 reason for premature engine wear is overheating. To maintain engine
performance, insist upon genuine Sherwood impellers and service kits.

6
Preventative Maintenance (continued)
Major Kit Major Kit Major Kit Major Kit
24006* 24024* 24007* 24008*
1-18000 Impeller 1-18000 Impeller 1-18000 Impeller 1-18000 Impeller
2-21561 Quad Ring 2-21561 Quad Ring 2-21561 Quad Ring 2-21561 Quad Ring
1-23837 Seal Assy 1-23837 Seal Assy 1-23837 Seal Assy 1-23512 Seal Assy
1-19762 Snap Ring 1-19762 Snap Ring 1-19762 Snap Ring 1-19762 Snap Ring
1-21566 Pin 1-21566 Pin 1-21566 Pin 1-21566 Pin
1-19866 Washer 1-19866 Washer 1-19866 Washer 1-19866 Washer
1-19869 Lip Seal 1-19869 Lip Seal 1-23045 Lip Seal 1-19869 Lip Seal
1-19867 Snap Ring 1-19867 Snap Ring 1-19867 Snap Ring 1-19867 Snap Ring
1-19836 Wear Plate 1-19836 Wear Plate 1-19836 Wear Plate 1-19836 Wear Plate
1-19837 Cover 1-19837 Cover 1-19837 Cover 1-19837 Cover
2-21533 Cam Liners 2-21106 Cam Liners 2-21533 Cam Liners 2-21106 Cam Liners
1-23840 Spacer 1-23840 Spacer 1-22778 Washer
1-22779 Gear Spacer
1-23840 Spacer
G1801
G1804 X
G1805 X
G1806 X
G18061-01 X
G1807 X
G18071-01 X
G1808 X
G18081-01 X
G1810 X
Note: New 23837 silicon carbide mechanical seal – Superior abrasion resistance and longer life. Standard in kits
shown above. 23837 is a direct upgrade of the 19878 mechanical seal (see “seal washer section” on page 2
to determine the proper spacer needed.)
* It is recommended that the shaft and bearing assembly is also replaced during the major rebuild or if the
shaft/bearing assembly is damaged. See the chart on page 3 to identify and order the proper assembly.

4/02
Form 3049
To maintain best engine performance and to prolong engine life - replace your impeller annually.*
Three tips to help you install your new impeller:
• Use a non-petroleum based lubricant (silicon or soapy water) to help slide the impeller into the housing.
• Install the impeller with a twisting motion onto the shaft. Never force an impeller onto the shaft. The impeller
must be able to move freely on the shaft to properly prime and function.
• Use a small amount of non-petroleum based lubricant to help hold the o-ring when replacing the cover.
Proper storage of the impellers during a prolonged lay-up can help maintain the life of the impeller.
Remove the impeller from the housing and store it a cool dark place. This will avoid the following:
• Copper bonding of the impeller to the housing
• Vanes "setting" into position as stored in the housing
• Ultraviolet deterioration
*See Maintenance Schedule on page 5
Genuine Sherwood Tech Tips
Inspection
The #1 reason for premature engine wear is overheating. To maintain engine
performance, insist upon genuine Sherwood impellers and service kits.
Recommended inspection to be performed at any service interval:
Impeller . . . . . . . . . Inspect for cracks or tears. Also, inspect for excessive abrasion of vane ends.
Replace annually, or if any of the conditions exist, as in the picture below.*
Wear Plate . . . . . . . Inspect for wear, flatness, and pin for fatigue. Replace at major pump rebuild
or if wear is evident to maintain pump flow and suction performance.
Cam . . . . . . . . . . . . Replace at minor or major pump rebuild or if pitting/wear is evident.
Cover . . . . . . . . . . . Replace at major pump rebuild or if wear exists to maintain
pump flow and suction performance.
Mechanical Seal . . Replace at minor and major pump rebuild or if leaking.
Lip Seal . . . . . . . . . Replace at major pump rebuild or if leaking.
Shaft . . . . . . . . . . . . Inspect for wear in area of lip seal and rubber impeller. Grooving of
lip seal area or heavy fretting of the impeller end shaft will require shaft replacement.
Bearing . . . . . . . . . . Inspect for loss of grease, corrosion or rough rotation. Replace at major pump rebuild as the entire
shaft and bearing assembly (see page 3 for proper assembly number).
Ripped
Vane
Bead Worn
To A Flat
Pitting Cavitation
Bowed (set)
Tear