(b)  
Connect the toilet drain tube from the service cart to the forward toilet service-panel. (TOILET DRAIN).

 (c)  
This step is applicable to airplanes with no toilet-drain ball valve installed: Pull the tank drain-valve handle on the forward toilet service-panel to drain the tank. (FWD TOILET).

 (d)  
This step is applicable to airplanes with a toilet-drain ball valve installed: Pull the disconnected drain valve cable to drain the toilet tank.

 (e)  
Remove the toilet-tank drain valve from the top of the toilet tank (AMM 38-32-31/401).

 (f)  
Examine the toilet-tank drain valve and the valve seat in the tank, for damage. 1) If you see damage to the valve seat, clean and repair the

 toilet tank as necessary. 2) If the rubber boot is damaged, replace the toilet drain valve. 3) If the toilet-tank drain valve is unserviceable, repair or replace as necessary.

 (g)  
Install the toilet-tank drain valve (AMM 38-32-31/401).

 (h)  
Fill the forward toilet system with water until the lavatory bowl is half full with water.

 (i)  
At the forward toilet service-panel, examine the inside of the toilet drain tube to make sure no water flows from the toilet tank.

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A 737-300/400/500MAINTENANCE MANUAL
 (j)  
On the forward toilet service-panel, do the applicable step that follows: 1) Install the drain plug, on the service panels without

 levers for a flapper valve. 2) Set the CLOSED lever so the flapper valve is closed, on service panels with OPEN/CLOSE levers. 3) Set the PUSH-TO-OPEN lever so the flapper valve is closed, on service panels with PUSH-TO -OPEN levers.

 (k)  
Close the drain valve assembly on the forward toilet service-panel (TOILET DRAIN).

 (l)  
Pull and lock the tank drain-valve handle on the forward toilet service-panel (FWD TOILET).

 (m)  
This step is applicable on to airplanes with a toilet-drain ball valve installed: Pull the disconnected toilet drain-valve cable to open the toilet-tank drain valve.

 S 216-027
 (22) In the electronic equipment compartment, do a full visual inspection of the components that follow:
 (a)  
The 4 inch toilet drain tube: 1) The connection under the toilet tank. 2) If applicable, the connections at the waste-drain ball

 valve. 3) The connection at the forward toilet service-panel.

 (b)  
For airplanes with modular toilets installed: The ground flush hose connection at the forward toilet service-panel.

 (c)  
For airplanes with non modular lavatories installed: The ground flush hose at these connections. 1) The flush hose connection at forward toilet service-panel. 2) The flush hose connector under the toilet tank.

 (d)  
The toilet drain valve control cable.

 S 966-028
 (23) If you find a leak on the forward toilet drain-tube, do the steps that follow:
 (a)  
If the leak is from a coupling, replace packings as necessary and tighten the clamps to stop the leak.

 (b)  
If the leak is from a damaged or holed drain tube, replace the drain tube.

 (c)  
If the leak is from an unserviceable drain ball valve, replace the valve (AMM 38-32-91/401).

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A
737-300/400/500MAINTENANCE MANUAL
 S 966-029
 (24)
 If you find a leak on the forward-toilet ground-flush hose, tighten the couplings or replace the flush hose (AMM 38-32-42/401).

 S 966-030

 (25)
 If you find a damaged drain valve control-cable, do the steps that follow:

 (a)  
If the control cable is unserviceable, replace the cable (AMM 38-32-41/401).

 (b)  
If you find the control cable is installed incorrectly, do the correct installation and adjustment procedure. (AMM 38-32-41/401).
　
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