Service engine – John Deere z425 User Manual

Page 24

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Service Engine - 23

SERVICE ENGINE

2. Clean air intake screen on top of engine and external surfaces with rag,
brush, vacuum or compressed air.

Checking and Cleaning Air Cleaner Elements (Single
Cylinder Briggs & Stratton)

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Let engine cool.

3. Clean dirt and debris from the air cleaner cover.

MX7680

4. Lift latch (A) to unlock cover (B). Lift cover forward and remove.

MX7679

5. Inspect the foam precleaner (C) without removing it. If the foam
precleaner is dirty:

a.Remove it from the filter carefully, leaving the paper element (D) in the
air cleaner housing.

b.Wash precleaner in a solution of warm water and liquid detergent. Do
not use oil.

c.Rinse precleaner thoroughly. Squeeze out excess water in a dry cloth
until precleaner is completely dry.

6. Inspect the paper filter element (D) without removing it. If the paper filter
element is damaged or dirty:

• Carefully remove the element from the air cleaner housing.

7. Clean air cleaner base very carefully, preventing any dirt from falling into
carburetor.

8. Install new paper filter element.

9. Install foam precleaner on paper filter element.

10. Install air cleaner cover and push latch down to lock.

Checking and Cleaning Air Cleaner Elements (Twin
Cylinder Briggs & Stratton)

1. Park machine safely. (See Parking Safely in the SAFETY section.)

2. Let engine cool.

3. Clean dirt and debris from the air cleaner cover.

MX37939

4. Loosen four knobs (A) and remove cover (B).

M96094

5. Do not drop anything into the carburetor air intake (C). If anything falls
into the carburetor air intake it must be removed.

6. Lift out filter cartridge (D) and inspect it for damage.

IMPORTANT: Avoid damage! Dirt and debris can enter the engine
through a damaged filter element:

• Do not wash paper element.

• Do not attempt to clean paper element by tapping against
another object.

• Do not use pressurized air to clean element.

• Replace element only if it is very dirty, damaged or the seal is
cracked.

B

A

B

D

C

IMPORTANT: Avoid damage! To prevent engine damage, do not
allow any foreign objects to fall into the carburetor air intake.

A

A

B

D

E

C

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