703

Visual Oil Level Inspection

Open electrical cabinet and visually inspect the way lube reservoir tank. Check oil level against minimum mark on tank sight gauge.

Ensure machine is powered down and locked out before opening electrical cabinet

Refill Way Lube Reservoir

Add Haas-approved way lubricant (typically ISO 68 slideway oil) to proper level. Fill slowly to avoid overfilling and allow float switch to settle.

Use only Haas-recommended lubricants to prevent float switch sticking or foam formation

Verify Float Switch Operation

Navigate to DIAGNOSTICS > I/O and monitor LUB LEVEL input while manually lifting float switch. Input should change from 0 to 1 when float rises.

Float switch should actuate smoothly without binding or hesitation

Clear Alarm and Test Cycle

Press RESET to clear alarm 703, then initiate a test cycle to verify way lube system operation and confirm alarm does not return.

Float Switch Continuity Test

Disconnect float switch connector and test continuity across switch terminals using multimeter. Switch should show continuity when float is raised, open when lowered.

Disconnect power and lock out machine before testing electrical components

Check Float Movement

Verify float moves freely up and down in reservoir without binding on tank walls or debris. Clean any contamination from float chamber area.

Float should have 1/8" clearance minimum from tank walls to prevent binding

Replace Float Switch Assembly

If switch fails continuity test, replace with genuine Haas float switch assembly. Ensure proper thread sealant on tank fitting to prevent leaks.

Apply thread sealant sparingly to avoid contaminating oil or blocking switch operation

Verify I/O Signal

With new switch installed, check DIAGNOSTICS > I/O page and confirm LUB LEVEL input responds correctly to float position changes.

Inspect Float Switch Connections

Check float switch connector for corrosion, loose pins, or damaged wiring. Verify connector is fully seated and locked in position.

Power down machine before disconnecting electrical connections

Trace Wiring Harness

Follow way lube float switch wiring from reservoir to control cabinet, checking for pinched, cut, or damaged conductors along cable routing path.

Pay special attention to areas where cables pass through cabinet walls or near moving components

Test Control Input Circuit

At control cabinet, locate LUB LEVEL input terminals and test continuity back to float switch. Check input card connections and terminal tightness.

Consult machine electrical prints to identify correct input terminals and wire colors

Repair or Replace Wiring

Repair any damaged wiring using proper gauge wire and connections. Replace entire harness if multiple damage points found.

Inspect Oil Condition

Check way lube oil for contamination, water, metal particles, or unusual viscosity. Oil should be clear amber color without debris or separation.

Milky appearance indicates water contamination, dark color suggests oxidation or contamination

Clean Float Switch Chamber

Remove float switch assembly and clean reservoir tank, especially around float chamber area. Remove any sludge or deposits that could affect float movement.

Dispose of contaminated oil according to local environmental regulations

Replace Way Lubricant

Drain contaminated oil completely and refill with fresh Haas-approved way lubricant. Prime lubrication system according to service manual procedures.

Run several lubrication cycles to purge old oil from system lines and fittings