25–02 Clutch Hydraulic Fluid
Changing
Replace the clutch hydraulic fluid every two years to
ensure clutch function is reliable and correct. Use the
procedures below. Fluid replacement must be done
at an authorized Freightliner service facility.
Flushing
1. Shut down the engine.
2. Apply the parking brakes, chock the front and
rear tires, and raise the hood.
WARNING
Clutch hydraulic fluid (DOT 4 brake fluid) is
hazardous. It may be a skin irritant and can cause
blindness if it gets in your eyes. Always wear
safety glasses when handling clutch hydraulic
fluid or bleeding hydraulic lines. If you get clutch
hydraulic fluid on your skin, wash it off as soon
as possible.
3. Prepare the pressure bleeding equipment
according to the manufacturer’s instructions. Use
DOT 4 brake fluid. Pressurize the bleed adaptor
to 15 psi (103 kPa).
NOTICE
Do not spill clutch hydraulic fluid (DOT 4 brake
fluid) on the cab paint. Clean it off immediately if
any is spilled. DOT 4 brake fluid can damage
paint.
4. Remove the reservoir lid and install the pressure
bleed adaptor on the reservoir.
5. Pressurize the reservoir, filling the system. Open
the bleed valve on the bleed tank of the adaptor.
NOTE: A pressure bleeder hose (J-29532) and
a bleed adaptor (J-35798) for the fluid reservoir
are available through SPX Kent-Moore Tools
and may be used to complete the following
procedure. To order these parts, call Kent-Moore
at 1-800-328-6657.
6. Flush the hydraulic system. See Fig. 3.
6.1 Open the bleed screw on the slave
cylinder.
6.2 Using a drain pan or other suitable
container, collect the fluid that drains from
the slave cylinder bleed valve, at least 0.5
quarts (0.5 liters).
6.3 When all the old fluid has passed through
the system and only new, clean fluid is
coming out, close the bleed screw.
7. Check the fluid level in the reservoir and bleed
the system according to the procedures under
the heading "Bleeding the Clutch." See
Fig. 4.
Bleeding the Clutch
1. Remove the cap from the bleed valve. Install a
transparent drain hose on the bleed valve of the
slave cylinder.
2. Open the slave cylinder bleed screw. Observe
the flow of clutch hydraulic fluid through the drain
hose. When bubbles no longer appear in the
fluid, close the slave cylinder bleed screw.
3. Disconnect the transparent hose. Tighten the
bleed screw 88 lbf·in (1000 N·cm) and install the
cap on the slave cylinder bleed valve.
4. Close the valve on the bleed tank of the
pressure bleed adaptor. Remove the pressure
bleed adaptor.
5. Check the fluid level in the reservoir. If
necessary, add or remove clutch hydraulic fluid
to bring the fluid level to the MAX line. Install the
reservoir lid.
NOTICE
When removing fluid from the reservoir, use a
clean tool that is used only for brake fluid. Using
a tool contaminated with oil or chemical residue
will destroy hydraulic system parts and cause the
system to malfunction.
6. Depress the clutch pedal a few times. There
should be resistance over the full pedal stroke.
7. Check the entire system for leaks. Tighten the
connections between the components if
necessary. Check the fluid level in the reservoir
again.
8. Make sure the reservoir lid is tight.
9. Lower the hood and remove the chocks from the
front and rear tires.
Clutch25
Business Class M2 Plus Maintenance Manual, 02/10/202325/2
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