Case CX75C SR Midi Crawler Excavator 2nd Option Line Proportional Control Kit Installation Instructions (47567850)

On a CX75C midi excavator that spends its life trenching in tight streets, loading trucks, or working around utilities, this installation manual is what you use to correctly fit and hook up the 2nd option line proportional control kit. It walks you through adding that extra hydraulic function so an attachment like a tilt bucket or grapple reacts smoothly to the joystick. When an operator complains that the new auxiliary line is jerky, dead, or running the wrong way, this is the document you pull out to trace hoses, verify connections, and confirm the control wiring was installed as intended.

Applications & Use Cases

• Identify each kit component so you can verify the delivery is complete before tearing into the machine.
• Follow the routing guidance to mount, route, and secure hoses, brackets, and valves without creating pinch or chafe points.
• Wire and connect the proportional controls at the joysticks and cab harness so the new line responds correctly.
• Trace and isolate installation errors when the auxiliary function won’t respond or moves opposite the joystick command.
• Use it as a reference when replacing damaged kit parts, so you reinstall them in the original locations.

FAQ

Q: Can I view this manual on a tablet in the field?

A: Yes, it’s practical to keep a digital copy on a tablet or laptop so you can zoom in on diagrams while working on the machine.

Q: Is it worth printing this manual?

A: Printing the key pages you’ll touch often—like diagrams and torque sequences—makes it easier to mark notes and keep it beside you in the shop.

Safety Note

Always depressurize the hydraulic system and lock out the machine before opening any lines or installing kit components.

Case CX75C SR Midi Crawler Excavator 2nd Option Line Proportional Control Kit Index:

1 KIT CONTENT
Kit content . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
2 PRE-ASSEMBLY
PREPARING FOR ASSEMBLY
Preparation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
3 ASSEMBLY
2ND OPTION LINE PROPORTIONAL CONTROL
Installation of hydraulic pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Boom line installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Pressure line installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Upper main line installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10
Pilot line installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14
Harness installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
Installation of housing cover. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-24
Control lever installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
Installation of nameplate inside cab . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-29

CNH