Bomusou Spindle Assembly 3-Pack for Toro/Exmark TimeCutter 42" & 50" Decks — Preinstalled Bearings, OEM Fit

These Bomusou replacement spindle assemblies restore mower deck rotation for 42" and 50" Toro/Exmark TimeCutter models, sold as a 3-pack that replaces part numbers like 117-0751 and 121-0751.

If your TimeCutter or compatible mower is showing worn spindle bearings, noisy decks, or uneven blade spin, replacing the spindle assemblies is a common repair that gets blades turning true again. This Bomusou kit includes three full spindle assemblies designed to fit a wide list of Toro and Exmark TimeCutter decks—covering 42", 50", and several 60" and 34" configurations—so you can refresh multiple spindles at once and reduce downtime.

Which Toro and Exmark models will these spindles fit?

These spindle assemblies are built to match the fit and mounting dimensions used on many TimeCutter decks. They are compatible with a large range of Toro and some Exmark decks commonly listed under the TimeCutter family.

• Fits Toro TimeCutter 42" models: SS4200, SS4216, SS4225, SS4235, SS4250, SS4260 and related ZS/ZX/MX variants.
• Fits Toro TimeCutter 50" models: SS5000, SS5035, SS5060, MX5000, MX5050, SW5000 and related variants.
• Also fits select 60" and 34" TimeCutter decks and replaces OEM numbers including 117-0751, 121-0751, 117-7268 and others.
• Spindle height and mounting hole spacing match common OEM specs: height 5-9/16" and mounting hole distance 5-1/2".

What comes in the Bomusou 3-pack and what are the dimensions?

The kit ships with three fully assembled spindles ready for direct replacement, including bearings and seals preinstalled. Each assembly uses the mounting and height dimensions associated with the referenced OEM replacements to simplify swapping old units for new ones.

• Quantity: 3 complete spindle assemblies per kit — enough for a typical three-spindle deck.
• Spindle overall height: approximately 5-9/16"; mounting hole center-to-center: roughly 5-1/2".
• Replaces part numbers: 117-0751, 117-7267, 117-7268, 117-7439, 120-6234, 121-0751, 121-9107, 139-3214.
• Shipped pre-assembled for faster install; check bolt sizes and torque specs for your mower model before installation.

How will replacing these spindles affect mower performance?

Installing fresh spindle assemblies restores smooth blade rotation and reduces wobble or vibration caused by worn bearings or damaged housings. That helps produce a cleaner cut pattern and reduces stress on belts and deck components.

• Reduces vibration and blade wobble for more even cutting height across the deck.
• Can extend belt life by restoring proper pulley alignment and spin.
• Preassembled units shorten repair time compared to sourcing individual bearings and seals.

Before you start: verify your mower's model and part numbers, follow the manufacturer's safety steps, and replace spindles in matched sets where appropriate to keep deck balance.

Who is this for? This Bomusou 3-pack is for owners and technicians of Toro TimeCutter and compatible Exmark mowers who need a reliable spindle replacement for 42" and 50" decks (and select 34"/60" decks). It’s suitable for DIYers comfortable with basic mower service and for professional maintenance shops that want a cost-effective kit to service three spindles at once. If you need to replace a single spindle, this kit still works but provides extra units for future maintenance or backup.