5. Remove cylinder from plate assembly (270)
and from moldboard assembly (10), IPL Figure
2, and lift out shift cylinder (40), IPL Figure 9.
6. Reverse procedure to install shift cylinders and
torque capscrews (50) to 210 in. lb. (23.7 N•m).
REPLACING MOLDBOARD LIFT HYDRAULIC
CYLINDERS
For replacement of the moldboard lift hydraulic
cylinders, refer to IPL Figure 9, Yoke Assembly.
Removal
1. Lower all hydraulically operated components
then turn engine off to stop hydraulic pumps.
2. Support lift cylinder (220) to be removed during
removal process.
NOTE: Place a container under hydraulic
hoses to catch any hydraulic fluid
when disconnecting hoses.
3. Disconnect hydraulic hoses from the lift cylinder
(220).
4. Remove two hex capscrews (230), lockwashers
(240) and the bearing cap (220), disconnecting
cylinder (220) from moldboard assembly (10),
IPL Figure 2.
5. Remove two capscrews (150), IPL Figure 9,
lockwashers (160), and each cylinder bottom
clamp plate (140).
6. Remove cylinder end cap (180), steel bushing
(190), drawbar bushing (200), and oil seal (210).
Installation
1. Install grease fittings (250) into cylinder end
caps (180).
2. Install new oil seals (210), drawbar bushings
(200), steel bushings (190), and cylinder end
caps (180).
3. Position cylinders (220) in cylinder clamps
(170).
4. Attach each cylinder bottom clamp plate (140)
with two capscrews (150) and lockwashers
(160).
5. Torque capscrews (150) to 105 in. lb. (11.9 N•m).
6. Attach bearing cap (220) with hex capscrew
(230) and lockwasher (240) to moldboard
assembly (10), IPL Figure 2.
7. Torque capscrews (230), IPL Figure 9, to 210 in.
lb. (23.7 N•m).
NOTE: If hydraulic fittings have been removed
from the cylinder, be sure that the
fitting with the orifice is attached at the
rod end.
REPLACING MOLDBOARD END BITS
For replacement of the moldboard end bits, refer to
IPL Figure 11 for the moldboard assembly.
1. Remove the four nuts (60) and plow bolts (50)
securing each end bit (40) to moldboard
weldment (70) and remove end bit (40).
2. Reverse procedures to install a new end bit.
REPLACING MOLDBOARD CUTTING EDGE
For replacement of the moldboard cutting edge,
refer to IPL Figure 11 for the moldboard assembly.
1. Raise moldboard so that cutting edges (10) are
off ground.
2. Remove the eight nuts (30) and plow bolts
(20) securing each cutting edge (10) to
moldboard weldment (70) and remove each
cutting edge (10).
3. Reverse procedures to install a new cutting edge.
REPLACING HYDRAULIC RESERVOIR
STRAINERS
For replacement of the hydraulic reservoir strainers
refer to IPL Figure 37.
Hydraulic Oil Suction Strainer and Hydraulic Oil
Strainer Filter
WARNING: Hydraulic oil is extremely hot
after use. Allow oil to cool before
servicing.
1. Lower all hydraulically operated components.
Turn engine off to stop hydraulic pumps.
2. Place a container with enough capacity to hold
the hydraulic fluid from the hydraulic tank.
3. Drain the hydraulic tank and discard the oil in
accordance with regulations.
4. Disconnect suction line from strainer.
5. Remove the oil suction strainer (20) or oil
strainer filter (30) as applicable.
6. Install new components.
7. Reconnect the suction line to strainer.
8. Refill the hydraulic tank with new hydraulic fluid.
9. Check system operation.
Section 4
MAINTENANCE
4-22
785 Motor Grader
Courtesy of Machine.Market
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