Briggs & Stratton 150Z Series manual Clean Deck Check / Replace Mower Blades, Blade Removal

CLEAN DECK &

CHECK / REPLACE MOWER BLADES

Service Interval: 25 hours or as required.

WARNING

For your personal safety, do not handle the sharp mower blades with bare hands. Careless or improper handling of blades may result in serious injury.

WARNING

For your personal safety, blade mounting capscrews must each be installed with two spring washers or a hex washer and spring washer, then securely tightened. Torque blade mounting nut to 80 - 90 ft. lbs. (108 - 122 Nm).

1.	Remove mower deck (see “Mower Deck Removal” in
	the OPERATION section).
2.	See Figure 20. Remove blade to inspect it or to
	safely access the underside of the mower deck. Use
	a block of wood to prevent blade rotation while
	loosening the capscrew by turning it
	counterclockwise.

LOOSEN

Figure 20. Blade Removal

Workbench

Nail

3.	Remove the capscrew (D, Figure 22), spring washer
	(C), hex washer (B), and blade.
4.	Clean the underside of the mower deck.
5.	Inspect the blades for nicks or dull edges. Use a file
	to sharpen blade to a fine edge. If the blade is
	damaged, it must be replaced.
6.	Balance the blade as shown in Figure 21. Center the
	blade’s hole on a nail lubricated with a drop of oil. A
	balanced blade will remain level. If the blade is not
	balanced, continue to sharpen the heavy side until it
	balances.
7.	Reinstall the blade with the lift wings (D, Figure 22)
	pointing up toward the mower deck as shown.
8.	Reinstall the spring washers (B, Figure 22) and nut
	(C). Use a wooden block (A) to prevent blade rotation
	while tightening the nut (C) to 80-90 ft. lbs. (108-122
	Nm).

Figure 21. Balancing The Blade

A D B

Figure 22. Blade Installation

C

A.	4x4 Wood Block	C. Blade Nut
B.	Spring Washers	D. Lift Wings

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