Adjusting Deck Lift Spring Tension (B and M Series Machines)

NOTE: Deck lift spring tension is adjusted at the factory. If the effort required to raise or lower the mower deck is not satisfactory, an adjustment may be necessary.

Check Spring Tension

1. Park machine on a hard, level surface.

2. Stop engine and lock park brake.

3. Raise the mower deck to the transport position.

4. Lift operator seat and lock into position.

5. 
   TCAL43472-UN-21MAR13

   Measure length (A).
   • Z900B Series Machines:
   
   

   Machines without Material Collection System installed:

   Deck	Recommended Factory Setting
   48 , 54, 60 Inch	21 mm (0.8 in.)

   Machines with Material Collection System installed:

   Deck	Recommended Factory Setting
   48 Inch	57 mm (2.2 in.)
   54 Inch	63 mm (2.5 in.)
   60 Inch	74 mm (2.9 in.)

   • Z900M Series Machines:
   
   

   Machines without Material Collection System installed:

   Deck	Recommended Factory Setting
   72 Inch	25 mm (1.0 in.)
   60 Inch	21 mm (0.8 in.)
   60 Inch - Mulch on Demand	18 mm (0.7 in.)
   54 Inch	43 mm (1.7 in.)
   54 Inch - Mulch on Demand	41 mm (1.6 in.)
   48 Inch	31 mm (1.2 in.)
   48 Inch - Mulch on Demand	21 mm (0.8 in.)

   Machines with Material Collection System installed:

   Deck	Recommended Factory Setting
   72 Inch	65 mm (2.6 in.)
   60 Inch	58 mm (2.3 in.)
   60 Inch - Mulch on Demand	52 mm (2.0 in.)
   54 Inch	87 mm (3.4 in.)
   54 Inch - Mulch on Demand	78 mm (3.1 in.)
   48 Inch	75 mm (3.0 in.)
   48 Inch - Mulch on Demand	Demand 58 mm (2.3 in.)

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Adjust Spring Tension

NOTE: Do not over tension the deck lift spring. If the spring is compressed too tightly, the mower deck will float too freely.

Decrease deck lift spring tension if operating in rough terrain.

While looking from rear of machine:

• Turn hex nut (B) clockwise to increase deck lift spring
• Turn hex nut (B) counterclockwise to decrease deck lift spring tension.