JLG 4017 Service Manual - Manual (Page 56)

Cab and Covers
4.4 4017
Note: ALWAYS use new o-rings when servicing the
machine.
4. Install new o-rings into the fittings. Lubricate the o-rings
with clean hydraulic oil.
5. Connect the load sense hose to the “LS” port at the
top of the steering valve.
6. Connect the four previously labeled hoses to the
appropriate ports.
7. Connect the battery negative (-) cable or cables at
the battery negative (-) terminal.
8. Carefully examine all connections one last time
before engine start-up. Rectify any faulty conditions.
9. Start the engine and check the operation of steering
system. Check for hydraulic fluid leaks. Check the
hydraulic fluid level in the tank and add fluid as
required.
10. Install the lower dash panel.
11. Close and secure the engine cover.
c. Steering Test
Conduct a pressure check of the steering hydraulic
circuits at the main control valve. Refer to Section 8.4.1,
“Hydraulic Pressures.”
4.3.2 Service Brake Pedal
a. Brake Valve Removal
Refer to Section 8.7.2, “Service Brake Valve,” for removal
information.
b. Brake Valve Installation
Refer to Section 8.7.2, “Service Brake Valve,” for
installation information.
c. Service Brake Pedal Removal
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in the (N) NEUTRAL,
engage the park brake and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition key switch and steering wheel, stating that
the machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Remove the battery negative (-) cable from the
battery negative (-) terminal.
5. Remove the lower dash panel.
6. Remove the circlip, flat washer, and the return spring
securing the service brake pedal to the cab.
7. Remove the clip/pin from the brake plunger fork link.
8. Remove the service brake pedal from the cab.
d. Service Brake Pedal Installation
1. Position the service brake pedal in its mounting
location within the cab.
2. Install the brake pedal being careful to reposition the
brake plunger yoke. Install the return spring, washer and
clip. Install clip/pin in brake plunger fork link.
3. Adjust the brake pedal as needed.
4. Install and secure the lower dash cover.
5. Connect the battery negative (-) cable or cables to
the battery negative (-) terminal.
6. Close and secure the engine cover.
4.3.3 Throttle Pedal
a. Throttle Pedal Removal
1. Park the machine on a firm, level surface, fully
retract the boom, lower the boom, place the
transmission control lever in the (N) NEUTRAL,
engage the park brake and shut the engine OFF.
2. Place an Accident Prevention Tag on both the
ignition key switch and steering wheel, stating that
the machine should not be operated.
3. Open the engine cover. Allow the system fluids to
cool.
4. Disconnect the battery negative (-) cable at the
battery negative (-) terminal.
5. Remove three capscrews securing the throttle pedal
assembly to the cab floor.
MZ0230