3. Stop engine.
4. Turn key to BULB CHECK position and release
to "arm" the monitor. Brake pressure indicator
must be off. Other indicator lights will be on and
stop engine indicator will flash.
5. Apply brake five times at 5 second intervals.
Brake pressure indicator must not come on
before three applications and pedal should feel
firm for five applications.
NOTE: If brake pressure indicator comes on
before three applications or pedal feels
"soft" before five applications: There is
a hydraulic leak in the brake system,
there is air in the brake system or the
nitrogen gas precharge in the
accumulator is too low.
CAUTION: Do not operate the machine until
the problem is resolved.
6. Continue to apply brakes until brake pressure
light is on. If pedal feels "soft" before brake
pressure light is on, do not operate the
machine until low brake pressure condition has
been corrected.
Replace Hydraulic Return Oil Filter
NOTE: Hydraulic return oil filter is a spin-on
type filter.
1. Remove spin-on filter.
2. Clean mounting surface.
3. Install new filter.
4. Add oil.
5. Start engine and run at one-half speed for 2
minutes.
6. Stop engine.
7. Check for leaks around filter. Tighten filter only
enough to stop leaks.
8. Check oil level.
Replace Transmission Oil Filter
NOTE: Transmission oil filter is a spin-on type
filter.
1. Remove spin-on filter.
2. Clean mounting surface.
3. Install new filter.
4. Add oil.
5. Start engine and run at one-half speed for 2
minutes.
6. Stop engine.
7. Check for leaks around filter. Tighten filter only
enough to stop leaks.
8. Check oil level.
Replace Fuel Filter
NOTE: Fuel filter is a spin-on type filter.
1. Remove spin-on filter.
2. Clean mounting surface.
3. Install new filter.
4. Loosen bleed screw.
5. Operate primer lever until fuel flows from bleed
screw is free of bubbles.
1000 HOUR MAINTENANCE PROCEDURES
Engine Speed
1. Warm engine to normal operating temperature.
2. Connect a tachometer to check engine speed.
Slow Idle 900 +/-25 rpm
Fast Idle 2500 +/-25 rpm
If engine speeds need adjustment, see your
authorized dealer.
Clean, Pack, and Adjust Front Wheel Bearings
NOTE: If machine is operated in wet or muddy
conditions, clean and pack bearing as
necessary.
1. Remove the following parts, see Figure 8.
a. Hub cap (10)
b. Gasket (30)
c. Cotter pin (40) and castle nut (50)
d. Retainer Washer (60)
e. Bearing cone (70)
f. Wheel Hub (90)
g. Bearing cone (110)
h. Bearing cup (120)
i. Tandem axle seal (100)
Section 4
MAINTENANCE
4-11
785 Motor Grader
Courtesy of Machine.Market
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