Toro Groundsmaster 5900 Series Service Manual page 447

Impact Arm Assembly
Impact Arm Installation
Groundsmaster ® 5900 & 5910
16227SL Rev B
(Figure 310) (continued)
All endplay must be removed from spring shaft assembly to allow
proper operation and ensure long life.
4. Grasp end of spring shaft. Push inward and pull outward on shaft to
determine if endplay exists between spring shaft assembly and impact arm
housing assembly.
5. If endplay in spring shaft assembly exists, insert a 3/4" socket onto jam nut
(item 21) on spring shaft. Access to jam nut can be obtained through the
open end of impact arm housing. Loosen jam nut until all endplay in shaft
is removed.
6. When no endplay exists in spring shaft assembly, remove two (2) cap screws
and nuts securing housing to impact arm housing and remove spring shaft
assembly from housing.
7. Thread second jam nut (item 21) onto end of spring shaft. While holding first
jam nut with a wrench to prevent it from turning, tighten second jam nut from
184 to 223 N·m (135 to 165 ft−lb) to secure spring adjustment.
8. Thoroughly pack spring with grease. Apply approximately 1.1 kg (40 oz)
of grease to a clean spring.
9. Install spring shaft assembly into impact arm housing and secure housing
(item 13) with four (4) cap screws and lock nuts.
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10. Thread rod end (item 22) with jam nut into end of spring shaft so that distance
from center of rod end to center of impact housing mounting hole is from
88.6 to 88.9 cm (34.89 to 35.01 in)
until impact arm is installed to deck.
(Figure 310 and
1. Position impact arm assembly to cutting deck connection and frame.
2. Slide pivot shaft (item 4) through impact arm housing and hub. Secure pivot
shaft with flat washer and lock nut.
3. Position a spacer on each side of impact arm rod end. Secure rod end to
deck connection with cap screw (item 26) and lock nut.
4. Tighten rod end jam nut (item 24).
5. Lubricate impact arm pivot hub grease fitting.
6. After installation is completed, raise and lower the cutting deck to verify that
hydraulic hoses and fittings do not contact anything throughout the entire
range of movement.
IMPORTANT
Figure 312
(Figure
Figure 311)
Page 7–33
312). Do not tighten jam nut
Chassis: Service and Repairs