Toto spares, Toto parts, Toto spare parts, Spare code no : TC377-E3.
The TOTO TC377-D1 spare part is a soft-close unit (1 pair) used in compatible TOTO toilet seats and covers. Its main purpose is to provide controlled, slow closing of the seat or lid instead of allowing it to slam shut.
Its uses include:
- Providing soft-close (slow-close) action for the toilet seat and lid.
- Preventing slamming, which reduces noise.
- Protecting the seat, hinges, and ceramic bowl from impact damage.
- Improving user comfort and extending the life of the toilet seat assembly.
The TC377-D1 typically contains two damping mechanisms (one for each hinge side) that use an internal rotary damper to slow the closing motion. TOTO does not publicly provide the internal engineering design or drawings for this component.
If you're planning to repair, redesign, or manufacture a compatible replacement, I can also explain how the soft-close damper works internally with a technical diagram.
The TOTO TC377-D1 is a replacement soft-close unit (supplied as 1 pair) used in selected TOTO toilet seat assemblies. It is a hinge-mounted damping mechanism that allows the toilet seat and/or lid to close slowly and quietly instead of slamming.
Technical details
- Part number: TC377-D1
- Part name: Soft Close Unit / Soft Closing Functional Part
- Quantity supplied: 1 pair (left and right dampers)
- Application: Compatible TOTO soft-close toilet seats
- Function: Provides controlled, damped closing of the seat and lid.
Typical construction
Although TOTO does not publish the internal engineering drawings, this type of soft-close unit generally consists of:
- A plastic housing
- A rotary damper
- Silicone oil (viscous fluid)
- A rotor and shaft
- Return spring
- Mounting features that connect to the hinge assembly
As the seat is lowered, the rotary damper forces silicone oil through internal passages, slowing the rotation and preventing the seat from dropping abruptly.
Common symptoms of failure
- Seat or lid slams shut
- One side closes faster than the other
- Oil leakage from the damper
- Loose or worn hinge action
Replacement
The TC377-D1 is intended to be replaced as a complete unit rather than repaired, since the damper is factory-sealed.
If your goal is reverse engineering or manufacturing a compatible TC377-D1, I can also provide:
- a cross-sectional design concept,
- estimated dimensions,
- material specifications,
- and a CAD model concept based on standard rotary soft-close dampers.
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Company Name : Bharat Enterprises.
Web : www.bechennai.com.
Mobile No : 888 333 33 22.
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