E35 Service Bulletin

Assembly and Disassembly instructions as provided by Manufacturer

Disassembly Instructions
(numbers in white)

Remove the screws and lockwashers that hold the cover to the body. Pull the cover and bushing assembly off the drive shaft.

Remove the vellum gasket. We recommend replacing the gasket each time the pump is assembled, however, if you plan to use the same gasket, it should be submerged in water until it is reassembled. If gasket dries it will shrink.

The impeller can now be removed by using pliers and grasping a vane on one side, then the other, alternating positions and gently pulling. Make sure you have a good grip on each vane so the pliers will not slip and damage the impeller.

The cam can be removed by removing the screw that goes down through the top of the body between the intake and discharge ports.

Remove the two screws and lockwashers from the bearing housing on the drive shaft end of the housing. This will allow you to remove the bearing housing, seal assembly and shaft from the body.

Remove the woodruff key from the shaft. If the shaft is to be used again and if it is put in a vise, always use lead over the jaws of the vise so that the shaft is not damaged.

Remove the retaining ring from the shaft at the seal end. The seal can now be removed from the shaft. Note how the seal and seat assembly are arranged so they can be properly reassembled.

By removing the large internal retaining ring from the bearing housing, the bearing and shaft can be pressed out of the bearing housing. Support the bearing housing and press on the shaft from the impeller end. Pumps designed without separate bearing housings may require shaft removal from opposite end depending on housing design.

The seat assembly is pressed into the bearing housing and can be removed by pushing a tool through the bearing end and against the rubber or backside of the seat.

Repair Note:

It may not be necessary to completely disassemble your pumps unless you want a complete or major repair. You should first determine, if possible, the cause of your pump problem.

Failure to prime or pump. (Generally, impeller, cam, and or cover wear.)
Leaking through drain holes in the bearing housing. (Seal problem)
Shaft wobble. (Major repair/wear of bushing, bearing, and or shaft.)

It is recommended when replacing the seal or seat that you replace both at the same time. Before assembling the pump, all parts should be inspected and parts replaced if excessive wear is noted.

Inspection and Replacement of Parts:

Cam - Replace if heavy pitting or wear is evident.
Impeller - Inspect for cracks or tears. Also, inspect for excessive abrasion of vane ends. Replace if any of the above conditions exist.
Mechanical Seal � Replace at major pump rebuild or if leaking.
Bearing � Inspect for loss of grease, corrosion or rough rotation. Replace if in doubt.

Assembly
(numbers in white)

When replacing the carbon bushing in the cover, care should be taken not to crack the bushing. A tool that pilots on the inside diameter and presses uniformly against the end of the bushing is recommended.
When assembling the cam, put Permatex #1 on back side of cam and the screw that retains the cam. Wipe off any Permatex that gets into the impeller cavity.

Assemble a retaining ring on the shaft into the second groove from the drive shaft end. Push the ball bearing over the shaft. Press on the inner race of the bearing. Push the bearing up against the retaining ring. Assemble the second snap ring over the shaft and up against the ball bearing, from the flat shaft end.

Push the bearing and shaft assembly into the bearing housing using care not to cock the bearing. A tool is recommended that will give you uniform pressure on the bearing outer race. Lock the bearing in place with the large internal retaining ring.

From the opposite end (woodruff key end of the shaft), assemble the seat over the shaft, rubber side first. Push it into the counter bore in the bearing housing. Do not damage (scratch) the white ceramic surface on the seat, or the seal and seat assembly might leak.

Push the seal assembly over the shaft and down against the seat. Do not damage the black carbon washer that rides against the ceramic.

Assemble the third retaining ring on the shaft. It will be necessary to compress the seal assembly to allow the retaining ring to enter the groove on the shaft.

Press the woodruff key into the keyway in the shaft.

Assemble the small gasket over the pilot on the bearing housing and assemble the complete shaft, bearing, seal assembly, to the body. Use the two long screws for fastening the bearing housing to the body.

Assemble the impeller over the shaft. Line up the key in the shaft with the keyway in the impeller and push the impeller into the body.

Push the gasket and cover over the dowel pins and attach the cover with the screws and lockwashers.

Start-Up Notice:
To prevent damaging the impeller, always wet or lubricate impeller with silicon before starting the pump.

Sherwood Technical Tips
Sherwood recommends replacing your impeller annually. However, as usage may vary vastly, Sherwood does have some storage tips for those who do not have many hours on your engine.
	Storing your impeller in a cool dark place avoids the following problems: Copper Bonding to the impeller as it sits in the housing Vanes "setting" in the position as stored in the housing Ultra Violet (Sunlight) deterioration
Sherwood suggests three easy tips to help you install your new impeller
	Use a non-petroleum based lubricant (i.e. silicon or soapy water) to help slide in the impeller Install the impeller with a twisting motion onto the shaft. Never force the impeller onto the shaft. The impeller must move freely on the shaft. The impeller must 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
Sherwood recommends inspecting your impeller closely during any pump maintenance. Replace the impeller if you discover either of the following.
	Tear or rip on any of the impeller blades. Flex the blades to examine more thoroughly. Severe wear on the impeller