Toro Greensmaster 3120 Service Manual page 181

Disassembling the Steering Cylinder
Assembling the Steering Cylinder
Greensmaster 3120
17230SL Rev C
1. Remove any fluid from the cylinder by slowly pumping the cylinder rod while
holding the cylinder over a drain pan.
2. Plug both cylinder ports and clean the outside of the cylinder.
Do not clamp vise jaws against the center of the cylinder barrel.
Clamp on the cap end of the barrel ONLY.
3. Mount the cylinder securely in a vise by clamping on the cap end of the
barrel. Using a vise with soft jaws is recommended.
Note: A high strength thread locker was used on the external collar during
cylinder assembly. Slowly heating the external collar will ease collar removal.
4. Use a pipe wrench to rotate the external collar counterclockwise until it is free
of the cylinder barrel.
5. Remove the plugs from the ports. Extract the rod, the head and the piston
assembly from the barrel by carefully twisting and pulling on the rod.
Do not clamp vise jaws against the cylinder rod surface. Use the
wrench flats provided on the cylinder rod ONLY.
6. Slide the piston off the rod.
7. Remove the wear ring, the seals, the back−up ring and the O−rings from the
piston and the head.
1. Make sure all the cylinder components are clean before assembly.
2. Coat the new wear rings, the O−rings, the seals and the back−up ring with
clean hydraulic fluid.
A. Install the wear rings and the seal to the outside of the piston.
B. Install the O−ring to the inner bore of the piston.
C. Install the O−ring, the back−up ring and the rod seals to the cylinder head.
3. Coat the rod with a light layer of clean hydraulic fluid and carefully slide the
piston assembly onto the rod.
Do not clamp vise jaws against the cylinder rod surface. Use the
wrench flats provided on the cylinder rod ONLY.
4. Install the lock nut on the cylinder rod. Hold the cylinder rod securely and
tighten the lock nut to 102 N−m (75 ft−lb).
5. Coat the rod with a light layer of clean hydraulic fluid and carefully slide the
head assembly onto the rod.
6. Coat all the internal parts with a light layer of clean hydraulic fluid. Slide the
rod assembly into the barrel being careful to not damage the seals.
IMPORTANT
IMPORTANT
IMPORTANT
Page 4–135 Hydraulic System: Service and Repairs