Toro Groundsmaster 1200 Service Manual page 51

Disassembling the Impact Arm Assembly
Assembling the Impact Arm Assembly
Groundsmaster® 1200 Pull-Behind Rotary Mower
18235SL Rev A
1. Disassemble the impact arm assembly (15) and pivot hub (18) as required.
2. Thoroughly clean the impact arm components and inspect for worn parts.
Replace components as needed.
1. Slide the washer (5), compression spring (6), second washer (5), plastic
bearing (7), third washer (5), flat washer (8) and one jam nut (9) onto the
spring shaft (3). Tighten jam nut so that spring length is 30.4 cm (12 inch).
2. Fit housing (4) over the rod end of assembled spring shaft assembly and
insert assembly into the impact arm housing.
3. Temporarily secure the housing to impact arm housing with two bolts (23)
and flange nuts (14).
All endplay must be removed from spring shaft assembly to allow
proper operation and ensure long life.
4. Grasp end of the spring shaft. Push inward and pull outward on shaft to
determine if endplay exists between the spring shaft assembly and impact
arm housing assembly.
5. If endplay in the spring shaft assembly exists, insert a 3/4 inch socket onto
the jam nut on spring shaft. Access to the jam nut can be obtained through
the open end of the impact arm housing. Loosen jam nut (9) until all endplay
in the shaft is removed.
6. When no endplay exists in the spring shaft assembly, remove the two cap
screws and nuts securing the housing to the impact arm housing and remove
the spring shaft assembly from the housing.
7. Thread second jam nut (9) onto the end of the spring shaft (4). While holding
first jamnut with a wrench to prevent it from turning, tightening second jam
nut from 184 to 223 N·m (135 to 165 ft-lb) to secure the spring adjustment.
8. Thoroughly pack spring (6) with the grease. Apply approximately 1.1 kg (40
oz) of grease to clean spring.
9. Install the spring shaft assembly into impact arm housing and secure the
housing with 4 bolts (23) and flange nuts (14).
IMPORTANT
Page 3–23 Chassis: Service and Repairs