TOTO CST746, CST748 Two Piece Toilet Installation Guide
- October 28, 2023
- TOTO
Table of Contents
CST746, CST748 Two Piece Toilet
Installation Guide
Warranty Registration and Inquiry
For product warranty registration, TOTO U.S.A. Inc. recommends online warranty
registration. Please visit our web site http://www.totousa.com. If you have
questions regarding warranty policy or coverage, please contact TOTO U.S.A.
Inc., Customer Service Department, 1155 Southern Road, Morrow, GA 30260 (888)
295-8134 or (678) 466-1300 when calling from outside of U.S.A.
THANKS FOR CHOOSING TOTO!
The mission of TOTO is to provide the world with healthy, hygienic and more comfortable lifestyles. We design every product with the balance of form and function as a guiding principle. Congratulations on your choice.
COMMON TOOLS NEEDED
- 10” adjustable wrench
- Carpenter’s Level
- Tape Measure
- Hacksaw
- Hand Pliers
- Flat Screwdriver
- Putty Knife
ADDITIONAL ITEMS (NOT SUPPLIED BY TOTO):
- Bowl Wax Ring
- Closet Flange Mounting Bolts (usually 2 T-bolts, 2 metal washers and 2 nuts)
- Water Supply Line (typically 1/2” compression to 7/8” ballcock)
- Toilet Seat (TOTO SoftClose recommended)
INCLUDED PARTS
Check to make sure you have all these parts from the package:
BEFORE INSTALLATION
- Read these instructions thoroughly before beginning work.
- Please leave instructions for customers. These instruction contain maintenance and warranty information.
- If necessary, remove the existing toilet.
For your new TOTO toilet to fit correctly, the rough-in, the distance between
the finished wall to the center of the closet flange, must be at least 12 inches
for most models.
NOTE: Models with 10” rough-in have model numbers ending with “.10”, for
example CT746CUFG.10.
Recommended water supply valve location: 5-7/8” (from floor) x 4-3/8” (from center).
INSTALLATION PROCEDURE
-
Clean any debris out of the closet flange and then install new mounting bolts (not supplied) into the slots of the closet flange (see Illustration 1). The head of the bolt should be inserted into the slot with its threads facing upward.
-
Carefully turn the toilet upside down onto some padding. Firmly press a new bowl wax ring (not supplied) onto the circular recess around the toilet bowl’s horn (see Ill. 2A). Turn the toilet upright and gently lower into position over the closet flange. With toilet properly aligned, press firmly on both sides of toilet rim to set the bowl wax ring. (see Illustration 2B)
CAUTION: Do not move the bowl after the bowl wax ring is set. Thread the
base caps, washers and nuts and tighten evenly until bowl is snug to closet
flange. Install the bolt caps (see Illustration 2C). 
CAUTION: Do not over-tighten
the nuts as damage to the china bowl may result.
NOTE: Three Points of Contact: The toilet bowl has three points o contact, which will actually contact the bottom of the toilet tank when properly installed. The location of these points can be seen on the bowl at the tank can be seen on the bowl at the tank receiving area. The three points are front left (1), front right (2), and back center (3). Recall these three points during the Toilet Tank installation. -
Place the tank upside down onto some padding. Inspect the smaller fill valve nut and larger flush valve nut for a secure connection (see Illustration 3). Try to tighten the nuts with your hands. If loose, tighten the nut hand tight and an additional 1/4 turn for the smaller fill valve nut and an additional 1/2 turn for the larger flush valve nut. Place the tank-to-bowl gasket onto the flush valve nut. While pressing down, spread the gasket over the nut until the gasket touches the bottom of the tank. A slight gap between the tank bottom and the gasket is allowable. See illustration 3.
-
Lay the tank down on its back. Place a rubber washer onto a bolt (see Illustration 4). Reach inside the tank and position the bolt through one of the holes in the bottom of the tank. On the outside of the tank, place a metal washer and nut onto the bolt. Hold the bolt centered in the hole and tighten the nut finger tight. Turn the nut an additional 1/2 turn with a wrench. Repeat this process for the remaining hole in the tank.
-
Pick up the tank and carefully guide the bolts to align the tank with the bowl. Attach hand tight nut to each bolt (see illustration 5A). Tighten until tank makes THREE POINTS OF CONTACT with the bowl (see illustration 5B).
-
Flush the water supply line for a few seconds to remove any debris that may enter the new fill valve. (For new home constructions and/or additions, flush the water supply line for more than a minute to help remove any residual PVC adhesives, solder flux, and/ or pipe sealants that were used for the new plumbing.) Connect the water supply line to the fill valve threads as seen at the bottom of toilet tank (see Illustration 6). Tighten this connection finger tight.
CAUTION: Avoid using a wrench to tighten the connection as you may damage the plastic threads and/or cause the fill valve to rotate inside the tank.
NOTE: The water supply pressure should be 20 to 80 psi static.
-
Flush toilet a few times to check for issues and leaks.
Make sure NO WATER LEAK on bowl and tank. -
Install the toilet tank lid onto the toilet tank top.
-
Install the toilet seat onto the toilet bowl using the mounting hardware in the toilet seat box. Place seat onto bowl and rotate the hinge down. Position seat stoppers under the seat hinge. Insert bolt into seat hinge and through the toilet bowl. Install plastic nut onto bolt from underneath. Tighten the bolt securely. Install the seat bolt caps.
NOTE: Tighten the seat bolt until the hinge is secure.
The seat and lid will have slight side to side movement, which is normal. This freedom of movement allows the seat to SoftClose® without binding.
MAINTENTANCE INSTRUCTIONS
Fill Valve Installation Procedure
-
Shut off the water supply to the toilet.
-
Flush toilet and remove remaining water from tank with a sponge.
-
Remove the water supply connection at the fill valve.
-
Remove old fill valve and use damp sponge to clean hole in tank.
-
Place new fill valve inside tank hole.
-
Thread mounting nut onto fill valve shank and tighten the nut.
NOTE: Do not over-tighten. Be sure to install fill valve in a position that does not interfere with the trip lever operation. -
Connect water supply to fill valve shank and hand-tighten only.
NOTE: Do not overtighten. These are plastic parts. Never use pipe dope on any water supply connection. -
Attach refill tube to fill valve nipple and clip other end of refill tube to the overflow pipe.
-
Turn water supply ON and check for leaks outside the tank.
Water Level Adjustment
Refer to the water level (WL) setting marked on the inner wall of the tank.
Allow the water to fill the tank. Turn the adjustment screw clockwise in the
(+) direction to increase the water level height (see ill. 1). Turn the
adjustment screw counter-clockwise in the (-) direction to decrease the water
level height. Flush the toilet to verify the correct water level.
Adjust as necessary. 
Replacing the Flush Valve
-
Turn off water supply and flush the toilet. Remove the remaining water from tank with a sponge.
-
Remove the tank lid and place it upside down on a clean surface.
-
Pull the clip on top of trip lever gear box as shown.
-
Pull gear box away and set on the side as shown. (see ill. 1 & ill. 2)
-
Rotate and pull up on the flush tower to remove it. (see ill. 3)
-
Remove the grey rubber seal gasket and rinse under running water to clean. (see. ill. 4)
-
Place the gasket back on the flush tower.
-
Align and place the flush tower into housing and gently press to snap and to lock into place.
-
Replace the trip lever gear box and push down on lever to lock it in place.
-
Carefully install the tank lid back on the tank.
-
Flush the toilet several times making sure the trip lever operates normally.
-
Check the water level in the tank and inspect for signs of any leakage.
CARE AND CLEANING
WARNING!
DO NOT USE IN-TANK BOWL CLEANERS.
The use of high concentration of chlorine or chlorine-related products can
seriously damage fittings in the tank. This damage can cause leakage and
property damage.
TOTO shall not be responsible or liable for any tank fitting failure or damage
caused by the use of in-tank bowl cleaners.
CEFIONTECT® CLEANING INSTRUCTIONS
WHAT IS CEFIONTECT®?
CEFIONTECT® is TOTO’s super-smooth permanent glaze that prevents debris
from sticking to surfaces. Products with the letter “G” in the number have the
CEFIONTECT® glaze. This glaze, along with regular cleaning, will help keep
your TOTO product in pristine condition.
NOTE:
For best results to keep your TOTO product with CEFIONTECT® clean:
- Lavatory: Use a mild dish detergent with a clean, soft cloth.
- Toilet: Use a gel based cleaner with a soft bristled-plastic brush.
- Don’t use cleaners, polishing powders or detergents that have gritty or coarse particles.
- Don’t use bleach, chemical thinners or products that have acid or alkaline detergents listed as ingredients.
- Don’t use metal scrub brushes or steel wool.
Following these instructions will ensure that your TOTO product with the CEFIONTECT® glaze will always stay intact, keeping your product like new for years to come!
WARRANTY
- TOTO warrants its vitreous china products (“Product”) to be free from defects in materials and workmanship during normal use when properly installed and serviced, for a period of one (1) year from date of purchase. This limited warranty is extended only to the ORIGINAL PURCHASER of the Product and is not transferable to any third party, including but not limited to any subsequent purchaser or owner of the Product. This warranty applies only to TOTO Product purchased and installed in North, Central and South America.
- TOTO’s obligations under this warranty are limited to repair, replacement or other appropriate adjustment, at TOTO’s option, of the Product or parts found to be defective in normal use, provided that such Product was properly installed, used and serviced in accordance with instructions. TOTO reserves the right to make such inspections as may be necessary in order to determine the cause of the defect. TOTO will not charge for labor or parts in connection with warranty repairs or replacements. TOTO is not responsible for the cost of removal, return and/ or reinstallation of the Product.
- This warranty does not apply to the following items:
- Damage or loss sustained in a natural calamity such as fire, earthquake, flood, thunder, electrical storm, etc.
- Damage or loss resulting from any accident, unreasonable use, misuse, abuse, negligence, or improper care, cleaning, or maintenance of the Product.
- Damage or loss resulting from sediments or foreign matter contained in a water system.
- Damage or loss resulting from improper installation or from installation of the Product in a harsh and/or hazardous environment, or improper removal, repair or modification of the (NOTE: Product model codes allow a maximum of 80 PSI. Check local codes or standards for requirements).
- Damage or loss resulting from electrical surges or lightning strikes or other acts which are not the fault of TOTO or which the Product is not specified to tolerate.
- Damage or loss resulting from normal and customary wear and tear, such as gloss reduction, scratching or fading over time due to use, cleaning practices or water or atmospheric
- Tank flushing mechanisms of plastic or rubber moving parts.
- Toilet seats of plastic, wood or metal.
- In order for this limited warranty to be valid, proof of purchase is required. TOTO encourages warranty registration upon purchase to create a record of Product ownership at http://www. totousa.com. Product registration is completely voluntary and failure to register will not diminish your limited warranty rights.
- THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS. YOU MAY HAVE OTHER RIGHTS WHICH VARY FROM STATE TO STATE, PROVINCE TO PROVINCE OR COUNTRY TO COUNTRY.
- To obtain warranty repair service under this warranty, you must take the Product or deliver it prepaid to a TOTO service facility together with proof of purchase (original sales receipt) and a letter stating the problem, or contact a TOTO distributor or products service contractor, or write directly to TOTO U.S.A., INC., 1155 Southern Road, Morrow, GA 30260 (678) 466-1300 or (888) 295-8134, if outside the U.S.A. If, because of the size of the Product or nature of the defect, the Product cannot be returned to TOTO, receipt by TOTO of written notice of the defect together with proof of purchase (original sales receipt) shall constitute delivery. In such case, TOTO may choose to repair the Product at the purchaser’s location or pay to transport the Product to a service facility.
WARNING! TOTO shall not be responsible or liable for any failure of, or damage to, this Product caused by either chloramines in the treatment of public water supply or cleaners containing chlorine (calcium hypochlorite). NOTE: The use of a high concentrate chlorine or chlorine related products can seriously damage the fittings. This damage can cause leakage and serious property damage.
THIS WRITTEN WARRANTY IS THE ONLY WARRANTY MADE BY TOTO. REPAIR, REPLACEMENT OR OTHER APPROPRIATE ADJUSTMENT AS PROVIDED UNDER THIS WARRANTY SHALL BE THE EXCLUSIVE REMEDY AVAILABLE TO THE ORIGINAL PURCHASER. TOTO SHALL NOT BE RESPONSIBLE FOR LOSS OF THE PRODUCT OR FOR OTHER INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES OR EXPENSES INCURRED BY THE ORIGINAL PURCHASER, OR FOR LABOR OR OTHER COSTS DUE TO INSTALLATION OR REMOVAL, OR COSTS OF REPAIRS BY OTHERS, OR FOR ANY OTHER EXPENSE NOT SPECIFICALLY STATED ABOVE. IN NO EVENT WILL TOTO’S RESPONSIBILITY EXCEED THE PURCHASE PRICE OF THE PRODUCT. EXCEPT TO THE EXTENT PROHIBITED BY APPLICABLE LAW, ANY IMPLIED WARRANTIES, INCLUDING THAT OF MERCHANTABILITY OR FITNESS FOR USE OR FOR A PARTICULAR PURPOSE, ARE EXPRESSLY DISCLAIMED. SOME STATES DO NOT ALLOW LIMITATIONS ON HOW LONG AN IMPLIED WARRANTY LASTS, OR THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE LIMITATION AND EXCLUSION MAY NOT APPLY TO YOU.
TOTO®
U.S.A., Inc. 1155 Southern Road,
Morrow, Georgia 30260
Tel: 888-295-8134 Fax: 800-699-4889
www.totousa.com
0GU193-2
Rev Date: 03/22
Warranty Registration and Inquiry
For product warranty registration, TOTO U.S.A. Inc. recommends online warranty
registration. Please visit our web site http://www.totousa.com. If you have
questions regarding warranty policy or coverage, please contact TOTO U.S.A.
Inc., Customer Service Department, 1155 Southern Road, Morrow, GA 30260 (888)
295-8134 or (678) 466-1300 when calling from outside of U.S.A.