How to Grease Mower Spindles

Mower spindles house a small shaft that transfers mechanical energy between the lawnmower belt and the mower blades. The spindles bolt to the mower deck and support the belt pulleys on the top and connect to the mower blades on the bottom, beneath the deck. Each spindle includes two bearings contained in a single cavity. The spindle shaft runs through the bearings at the top and the bottom of the spindle housing. In order to maintain the mower spindles in good working order, grease the bearings at least twice during a mowing season.

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Mower spindle lubrication is important for extending the life of a lawn mower.

Step 1

Operate the mower deck for up to five minutes to warm and soften the existing grease inside the mower spindles.

Step 2

Park the mower and set the parking brake.

Step 3

Lower the mower deck to its lowest setting using the deck adjustment lever on the lawn mower. The grease fittings mount to the spindles just above the mower deck. Lowering the deck from the mower allows more access to the spindles for servicing.

Step 4

Spray each grease fitting with a light coat of machine oil and wipe each fitting clean with a lint-free shop rag. Removing the dirt from the fitting allows the fresh grease to flow unrestricted through the fittings and into the spindle housings.

Step 5

Press the grease gun coupling onto each fitting and pump the gun handle three to four times. If more than a year has passed since the last time the spindles were greased, double the pumps of grease to six or more.

Step 6

Wipe extra grease from the grease fittings with the rag after each spindle has been greased.

Step 7

Start the lawn mower and run the mower deck for five or six minutes to disperse the grease within the spindles.