Sherwood 26000 Series, G2602-01, G2603-01, G2601-01, G2604-01 Technical Manual

The Original Engine Cooling Pump Since 1921

www.sherwoodpumps.com

26000 Pump Series Technical Guide

Identification

G2601-01, G2603-01

Note: G2603-01 has an integrated cam. (There is no

cam screw as the cam is part of the housing.)

G2601X, G2601-02, G2603-02

Note: G2603-01 has an integrated cam. (There is no

cam screw as the cam is part of the housing.)

G2602-01, G2604-01

Note: G2604-01 has an integrated cam. (There is no

cam screw as the cam is part of the housing.)

G2605-01

Assembly / Disassembly Instructions

15

18

24

27

17

16

12

13

27

11

21

10

22

9 28

14

20

5

6
7

4

8

23

3

19

2

1

9

26

25

2

Disassembly

Note: It may not be necessary to perform the entire disassembly procedure for the intermediate and minor kits.

A. Remove the bolts (1) and lockwashers (2) from the cover (3).

B. Remove the cover, o-ring (4), and impeller (5), using puller number 23631 or 3/4” x 16 UNF bolt. Note the

direction of the impeller blades to ensure proper replacement of the impeller during the assembly procedure.

C. When applicable, remove the cam screw (6) and cam screw o-ring (7) from the cam. The cam (8) and wearplate

(9) can now be taken out of the housing.

For the G2603, G2604 and G2605 pump models with integrated cam designs, remove the two wearplate flat

D.

head screws (28) holding the wearplate in place.

E. Using external snap ring pliers, remove the retaining ring (10) from the shaft.

F. Slide the washer (11) and mechanical water seal (12) off of the shaft.

G. Remove the bolts (13) holding the body (14) to the housing (15).

H. Slide the housing off of the shaft and body assembly.

I. Press the seal seat (16) out of the housing.

J. Remove the drive gear assembly. While supporting the drive gear (17), remove the nut (18) from the shaft.

K. Using internal snap ring pliers, remove the retaining ring (19) from the body.

Press the bearing and shaft assembly (20) out of the body

L.

M. Remove the lip seal (21) and o-ring (22) from the body.

N. 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

, replace the entire shaft and bearing assembly (20) listed on page 3.

wear

2

.

Assembly / Disassembly Instructions (continued)

Warning: Do not try to build the shaft and bearing assembly from the individual parts, but instead purchase the kit

with entire shaft and bearing assembly listed below. Special assembly procedures for this assembly must be fol-

owed to prevent galling of the shaft in the lip seal and mechanical seal area, which could cause premature seal

l
leaks.

Assembly

A. Replace the o-ring (22) in the pump body (14), then press the lip seal (21) in place with the metal backing ring of

the lip seal toward the housing (15) and away from the engine, until it is flush with the body surface. Care
should be taken to ensure 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 (20) into the pump body. Preferably, use a sleeve or piece of tubing,

slightly bigger than the shaft (25mm) or about an 1” opening, to push against the inner race of the ball bearing.

C. Using internal snap ring pliers, install the retaining ring (19) into the body. Then slide the slinger (23) onto the

impeller end of the shaft to about 1/8” away from the bearings.

D. Press the mechanical seal seat (15) into the housing with the 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 ensure that the cup did not become partially dislodged during the assembly proce
dure.

E. Slide the housing (15) over the shaft and body assembly. Use Loctite® Primer and Loctite® 262 or equivalent on

the body to housing bolts. Fasten the three bolts (13) and torque them to 18 ft-lbs.

F. When applicable, replace the drive gear assembly. Use Loctite® Primer and Loctite® 262 or equivalent on the

gear nut. Slide the gear (17) on the shaft, and then tighten the nut (18) onto the shaft. While supporting the
drive gear, torque the nut to 130-140 ft-lbs.

G. Lubricate the inner rubber portion of the mechanical water seal (12) with a water soluble lubricant or soapy

water and slide the seal onto the shaft, with the silicon carbide portion of the mechanical water seal (12) toward
the seal seat (16).

Note: The two mating surfaces must be the gray silicon carbide portion of the seal to the gray silicon carbide portion
of the seal seat. Oil or grease must not be used to prevent the mechanical seal from properly gripping the shaft.

H. Place the washer (11) onto the shaft and then using external snap ring pliers, install the retaining ring (10) into

the groove in the shaft to compress the mechanical seal.

I. Install the wearplate (9) with the anti-rotation tab into the recess in the housing.

J. For the G2603, G2604 and G2605 pump models with integrated cam designs, apply Loctite® 242 to the

wearplate flat head screw threads (28), replace the two screws to secure the wear plate, and torque them to 50
in-lbs.

K. When applicable, replace the cam (8) in the housing. Place the cam screw o-ring (7) onto the cam screw (6) and

then fasten the cam screw in place.

Insert the impeller (5) in the housing using a twisting motion. Ensure that the impeller blades are bent in the

L.

same direction as upon removal. 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).

M. Insert the O-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.

N. If necessary to replace the port elbow

Fasten the lockwashers and bolts (26) through the port bracket to the housing and torque to 12 ft-lbs.

O. Inspect the seals, housing, body and cam areas for leaks after installation.

, slide the port (24) through the bracket (25). Replace the o-ring (27).

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