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Servicing Instructions for Jabsco Manual Marine Toilets


Servicing Instructions

Jabsco manual toilets do not normally require maintenance during the season, provided that they are winterised in the autumn and overhauled in the spring. However, any toilet will benefit from:

  • Thorough flushing - refer to OPERATING INSTRUCTIONS for NORMAL USE.
  • Regular use - if not used regularly lubrication is beneficial - refer to OPERATING INSTRUCTIONS for FIRST USE.
  • Regularly check all fastenings for tightness and leaks.


  • HAZARD RISK - Leaks

    If the toilet is connected to ANY through-hull fittings and, if the toilet or the pipework develops a minor leak, it can suddenly become a major leak that allows water to flood in, causing the craft to sink, which may result in loss of life. Therefore, if ANY leak develops you MUST repair it immediately.

    REPAIR LEAKS IMMEDIATELY!


    1. Servicing & Winterization - preparation

    Jabsco manual toilets are designed to be user serviceable and no special skills or tools are required.

  • Flush the toilet in accordance with the OPERATING INSTRUCTIONS for NORMAL USE and, in particular, ensure that all waste has left the discharge pipework and that the bowl is empty.
  • CLOSE BOTH SEACOCKS (even if secondary valves are fitted)
  • If the vessel is being wintered afloat, WIRE SEACOCKS SHUT
  • Be ready to mop up any water that may come out of the system.


  • 2. Servicing - Seal replacement


    If water begins to leak around the piston rod (key 29) at the top of the pump, the seal assembly (key 18) is worn and must be replaced.

    YOU WILL need:
  • A Seal housing Assembly 29044-3000.
  • Unscrew the seal housing assembly (key 18) using a 24mm (15/16") spanner and remove the entire piston rod assembly from the toilet.
  • Wrap some tape around the piston rod within 16mm (5/8") of the handle. Grip the piston rod through the tape, unscrew the handle and remove the bumper washer (key 25). Remove the tape.
  • Slide the old seal assembly off the piston rod. Wrap one turn of tape around the thread at the top of the piston rod to protect the new seal and slide the new seal assembly onto the piston rod. Remove the tape from the thread.
  • Wrap some tape around the piston rod within 16mm (5/8") of the handle.
  • Grip the piston rod through the tape and replace the bumper washer and handle. Remove the tape from the piston rod.
  • Slide the whole assembly back into the pump cylinder and tighten in place.


  • CAUTION: Gripping the piston rod with a tool anywhere except on the 16mm (5/8") below the handle damages the surface in a way that causes rapid seal failure.


    3. Servicing - Winterisation

    Drain the complete system, both as protection against frost damage and to discourage the growth in the pipework of anaerobic bacteria that cause unpleasant smells.

  • Open any secondary valves.
  • Remove the base drain plug (key 8).
  • Disconnect the discharge flange (key 32) from the pump (avoiding the need to remove the hose from the discharge elbow (key 34).
  • Loosen hose clips and disconnect the hose ends from both seacock hose tails. Pump the handle (key 17) to drain the toilet pump and ensure that all water is drained from the toilet system.


  • CAUTION: The use of anti-freeze is NOT RECOMMENDED, as it is impossible to ensure that it penetrates the complete toilet system. If, for any reason, anti-freeze is used it MUST be glycol based. If you plan to overhaul the toilet in the spring, this is a good time to disassemble it and take the components ashore to make the overhaul easier.


    HAZARD RISK - Seacocks opened by mistake
    If you leave the toilet disassembled and, if the seacocks are opened when the craft is afloat, water will flood in and may cause the craft to sink, which may result in loss of life. Therefore, you MUST attach a warning notice to the seacocks and, if possible, wire the seacocks shut.


    ATTACH WARNING NOTICE! If you are not disassembling the toilet:
  • Reconnect all hose ends and secure them with their hose clips. Replace the base drain plug securely.
  • Replace the joker valve in the discharge elbow.
  • Reconnect the discharge elbow and hose to the cylinder using the discharge flange, whilst relieving any leverage from the discharge hose. If you do not, the joint may not seal.
  • Fasten down the seat, lid and pump handle to prevent use and attach a warning notice.


  • 4. Servicing - Overhaul

    YOU WILL need:

  • A Service Kit, part number 29045-3000, which contains all wearing parts - refer to the PARTS LIST for details.
  • Remove the pump assembly as follows:
  • Loosen hose clips; disconnect the inlet hose and the flushing water hose (key 4) from the top of the pump.
  • Remove the 2 screws (key 31) that secure the discharge flange (key 32) that holds the discharge elbow (key 34) and hose to the pump cylinder (key 28).
  • Do NOT remove the hose from the discharge elbow.
  • Remove the 4 screws (key 31) that secure the pump cylinder to the base. Lift off the pump assembly and pick up the base valve gasket (key 16) and the joker valve (key 33).
  • Dismantle the pump assembly as follows:
  • Remove the 6 screws (key 26) that secure the valve cover (key 27).
  • Open () the Flush Control (key 23) before lifting off the valve cover assembly and picking up the top valve gasket (key 21), the valve seat (key 19) and the valve spring (key 35).
  • Remove the handle and the seal assembly by following the SERVICING INSTRUCTIONS for SEAL REPLACEMENT.
  • Withdraw the piston assembly (key 29) and prise off the piston O-ring (key 30).
  • Do NOT remove the bowl from the base
  • Clean and disinfect all parts - refer to OPERATING INSTRUCTIONS for CLEANING. Remove scale from the cylinder bore.
  • Inspect the top and bottom valve gaskets (key 21) and the joker valve, and renew them if they are damaged, stiff or covered with scale.
  • Automatically renew the seal assembly and the piston O-ring. Use the other parts in the kit as necessary.
  • Reassemble the pump as follows:

  • Push on the new O-ring (key 30) and lubricate with petroleum jelly (vaseline).
  • Following the SERVICING INSTRUCTIONS for SEAL REPLACEMENT fit the new seal assembly (key 18), the piston assembly (key 29) and the handle (key 17).
  • Lubricate pump cylinder bore with petroleum jelly (Vaseline).
  • Locate the valve seat (key 19) on top of the cylinder, locate the top valve gasket (key 21) on its pegs on top of the cylinder, locate the valve spring (key 35) on its peg in the valve cover, and Open () the Flush Control (key 23) before refitting the valve cover (key 27).
  • Locate the joker valve (key 33) in the discharge elbow (key 34).
  • Secure the discharge elbow and hose to the cylinder, using the discharge flange (key 32), BEFORE you refit the pump assembly to the base (key 7), so that the joint is not under leverage from the discharge hose. If you do not, the joint may not seal.
  • Locate the bottom valve gasket (key 16) on its pegs on the base. Secure the pump assembly to the base whilst relieving any leverage from the discharge hose. If you do not, the joint may not seal.
  • Examine all hoses throughout their length for chafe, kinks and splits under hose clips. Check all hose clips for corrosion and replace worn or damaged parts.
  • Reconnect all loose hose ends and secure them with their hose clips. Ensure that the base drain plug (key 8) is securely in place.
  • CAUTION: Do NOT lubricate top or bottom valve gaskets. Do NOT apply sealing compounds to any gaskets or hose connections.



    5. Servicing - Testing

    REFER to the OPERATING INSTRUCTIONS and follow the procedure for "2. Normal use". If the flushing pump is hard to prime, half-fill the bowl with fresh water. ON COMPLETION OF SERVICING: SHUT () THE FLUSH CONTROL CLOSE BOTH SEACOCKS.

    Trouble Shooting

    Bowl fills when toilet not in use
  • Shut Seacocks.
  • Fit Vented Loops
  • Waste water re-appears in bowl
  • Check Bottom Valve Gasket - (16) and Joker Valve (33).
  • Bowl does not empty & difficult to push handle down
  • Open Outlet Seacock.
  • Fully shut Flush Control Lever - (23).
  • Check Joker Valve (33), - Discharge Hose or Outlet Seacock for blockage.
  • Bowl does not empty and difficult to pull handle up
  • Remove pump and check for - blockage.
  • Bowl does not empty although handle is easy to push & pull
  • Check Piston O-ring (30), - Bottom Valve Gasket (16) & Joker Valve (33).
  • Water does not come in and handle springs up if pushed down
  • Open Inlet Seacock.
  • Fully open Flush Control - Lever (23).
  • Water does not come in although handle is easy to push and pull
  • Open Flush Control Lever - (23).
  • Check Top Valve Gasket (21) - and Piston O-ring (30).
  • Check Inlet Hose connections - are airtight.
  • Flush water is slow to appear during pumping
  • Shorten Inlet Hose from main - Seacock.
  • Do not fit Vented Loop - between Inlet Seacock & Pump
  • Fit between Pump & Bowl.
  • Fit Non-Return Valve (29295-- 1011) next to Inlet Seacock.


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