Case IH 1201 – Instrument Cluster (IC) or Universal Control Module (UCM): Hydraulic Filter Restriction Switch Open Circuit

The controller has detected an open circuit in the electrical circuit for the hydraulic filter restriction switch, pointing to a broken wire, a disconnected harness, or an internally failed switch.

• skid steer
• Skid Steer Loaders (SSL)
• Compact Track Loaders (CTL)
• SR130
• SR150
• SR160
• SR175
• SR200
• SR210
• SR220
• SR240
• SR250
• SR270
• SV185
• SV250
• SV280
• SV300
• SV340
• TR270
• TR310
• TR320
• TR340
• TV380

1. 1

   Visually inspect the hydraulic filter restriction switch (at the filter head) and wiring harness connector for disconnected pins, corrosion, or physical damage.

2. 2

   Perform a switch resistance test: disconnect the harness and measure resistance across the switch terminals. If it reads completely open (infinite resistance), the switch has failed internally.

3. 3

   Perform a harness continuity test: measure resistance through the signal wire using a jumper wire to connect the IC/UCM pin to a clean chassis ground. Check for an open circuit or short to ground.

4. 4

   Check the hydraulic filter and the cooler return screen at the hydraulic reservoir for heavy restriction or debris.

1. 1

   Relieve Pressure

   Ensure the machine is turned off, the loader arms are lowered (or properly locked), and hydraulic pressure is relieved.

2. 2

   Locate the Switch

   Access the hydraulic filter housing. The restriction switch is threaded into the filter head.

3. 3

   Disconnect and Remove

   Unplug the electrical connector from the switch. Use a wrench to carefully unthread the restriction switch from the filter housing.

4. 4

   Install New Switch

   Thread the new restriction switch into the filter head. Do not overtighten, as this can damage the threads or the switch housing.

5. 5

   Repair Wiring

   If the diagnostic tests proved the switch was good but the harness was open, trace the signal wire back to the IC/UCM and repair the break in the wire.

6. 6

   Replace Filter

   If the hydraulic filter is near its service interval, replace the spin-on hydraulic filter element and top off the hydraulic fluid.

7. 7

   Clear Codes

   Turn the key switch on, operate the machine, and use the service tool or instrument cluster to verify the active DTC 1201 has been cleared.