Product name: John Deere Belt Set
Part No: TCA14778
Model Number:For X300 Series, X500 Series, X700 Series
Material:Lron+Rubber
Packing:PP bag inside, carton box outside
Payment Terms:Western Union, L/C, T/T, MoneyGram, D/A, D/P
MOQ:Acceptable trial order
Shipping Mode:By air, by sea, by express(Fedex, UPS, DHL, TNT, etc.)
Place of Origin:Guangdong, China
Brand name: John Deere
| Parameter | Value / Specification |
|---|---|
| OEM Part Number | TCA14778 |
| Product Type | Mower Deck Drive Belt Set |
| Belt Construction | Aramid Fiber Reinforced / Kevlar®-Grade Tensile Cord |
| Rubber Compound | Heat-Resistant EPDM / Neoprene Blend |
| Belt Profile | Wrapped / Raw Edge (Per OEM Design) |
| Number of Belts in Set | 1-2 Belts (Depending on Deck Configuration) |
| Tensile Strength | High (Engineered for shock load resistance) |
| Temperature Range | -30°F to 212°F (-34°C to 100°C) |
| Friction Coefficient | Optimized for reliable grip without slippage |
| Stretch Resistance | Minimal (Pre-tensioned for stable performance) |
| Compatible Deck Sizes | 48", 54", 60" (Varies by model) |
| Manufacturing Standard | Manufactured to meet or exceed John Deere OEM specifications |
| Maintenance Item | Recommendation |
|---|---|
| Inspection Frequency | Inspect mower deck drive belts before each use or at least every 25 hours of operation for signs of wear, cracking, fraying, or glazing |
| Tension Check | Verify proper belt tension according to equipment manual. Loose belts cause slippage and poor cutting; overtight belts cause premature bearing and belt failure |
| Cleaning | Keep belt area free of grass clippings, debris, and oil to prevent slippage and premature wear. Clean deck thoroughly after each use |
| Pulley Inspection | When replacing belts, inspect all pulleys for wear, damage, rust, or misalignment. Worn pulleys will quickly damage new belts |
| Idler Arm Check | Verify idler arm and spring tension mechanism moves freely and provides proper tension. Lubricate pivot points as specified in equipment manual |
| Replacement Interval | Replace every 200-300 hours of operation or at first signs of cracking, fraying, or significant wear to prevent unexpected failure |
| Storage | Store spare belts in a cool, dry place away from direct sunlight, ozone sources, and chemicals. Avoid kinking or hanging on sharp hooks |
| Break-In Period | New belts may require a short break-in period (2-4 hours) to seat properly. Re-tension if necessary after initial use |
| Safety Category | Precaution / Instruction |
|---|---|
| Personal Protection | Wear safety glasses and work gloves when inspecting or replacing mower deck belts to protect against debris and pinch points |
| Engine Shutdown | Always shut off engine, remove ignition key, and disconnect spark plug wire(s) before inspecting or replacing drive belts |
| Wait for Cooling | Allow engine and belt components to cool completely before handling to prevent burns from hot surfaces |
| Pinch Point Hazard | Keep hands, fingers, and loose clothing clear of belt and pulley areas during installation and tensioning to prevent entanglement or crushing injuries |
| Secure Mower Deck | When working under the mower deck, ensure deck is securely supported with jack stands or blocking. Never rely solely on hydraulic or mechanical lift systems |
| Proper Tools | Use appropriate tools for belt tensioning and removal. Do not use excessive force or pry bars that may damage components |
| Belt Storage | Store belts flat or coiled loosely. Do not kink, twist, or hang on sharp edges which can damage the tensile cord structure |
| Disposal | Dispose of worn belts in accordance with local regulations. Do not burn rubber belts as they may produce toxic fumes |
| Injury Response | For pinch injuries, seek medical attention. For eye injuries from debris, flush with water and seek immediate medical attention |
| Application | Compatible Equipment | Deck Size / Model |
|---|---|---|
| John Deere Lawn Tractors | X300 Series, X500 Series, X700 Series | 48", 54" Mower Decks |
| John Deere Garden Tractors | X300, X500, X700 with compatible decks | 48" Accel Deep Deck, 54" High-Capacity Deck |
| John Deere Zero-Turn Mowers | Z300 Series, Z500 Series, Z700 Series | 48", 54", 60" Mower Decks |
| John Deere Compact Tractors | 1023E, 1025R, 2025R with mid-mount mowers | 54D, 60D AutoConnect Decks |
| Deck Drive Configuration | Engine to Deck Drive Belt (Primary) | Replaces OEM TCA14778 belt set |
| Belt Cross Reference | TCA14778 | Direct OEM Replacement |
LA series (LA105, LA115, LA125, LA135, LA145, LA155, LA165, LA175)
D series (D105, D110, D125, D130, D140, D155, D160, D170)
E series (E100, E110, E120, E130, E140, E150, E160, E170, E180)
S series (S120, S140, S160, S170, S180)
X100 series (X105, X145, X155, X165, X175)
L100 series (L105, L107, L108, L110, L111, L118, L120, L130)
LA100 series (LA105, LA115, LA125, LA135, LA145, LA165, LA175)
Always verify your original part number (TCA14778) or measure the old belt.
2. What’s included in the belt set?
A: The COGENG TCA14778 kit includes two belts:
Primary drive belt (deck belt) – from engine pulley to mower deck.
Secondary drive belt (double-sided or transmission drive belt) – from deck to blades or secondary pulleys depending on model.
Some versions may also include an idler pulley or installation tool, but check the specific product listing.
A: No. COGENG is an aftermarket brand. It is not OEM John Deere, but is designed to meet or exceed OEM specifications. Many users report it fits well and performs similarly to the original John Deere belt at a lower cost.
A: Typical dimensions:
Main deck belt: Approx. 1/2" width × 92.5" length (varies slightly by deck)
Secondary belt: Approx. 1/2" width × 37–39" length (double-sided Kevlar on some models)
*Exact specs: 1/2" x 92.5" and 1/2" x 37.5" (for 42" deck) or 48" deck variations.*
A: General steps:
Remove mower deck (or raise front).
Relieve belt tension using deck spring/idler.
Remove old belts.
Install secondary belt first (if dual-belt system).
Install primary deck belt around engine pulley, idlers, and spindle pulleys.
Re-tension and check alignment.
YouTube search: “John Deere TCA14778 belt replacement” – many video guides.
A: Possible causes:
Incorrect belt routing (check diagram under deck or owner’s manual).
Worn or seized idler pulley or spindle bearing.
Belt tension spring weak or disconnected.
Wrong belt size (measure old vs. new).
A: Under normal mowing conditions (dry grass, no debris), expect 200–300 hours. Aftermarket belts like COGENG typically last 1–3 seasons depending on use and maintenance.
Contact COGENG
📞 Phone: +86-185-2913-1515
📧 Email: hugo@cogeng.net
💬 WhatsApp +86-185-2913-1515
💬 WeChat: +86-185-7865-1106
🌐 Website: cogeng.net
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