35 Years of Hydraulic Expertise  ·  Old-School Communication.  New-School Service.

978-368-3325

T.T. Weber Hydraulic

Industrial hydraulic solutions · Built to keep your equipment running

Oil Guard

Oil-Stop Reservoir Cap Switch

A $159 switch that prevents a $10,000 problem.

Stop a leak before it stops your wallet — or the EPA.

Oil Guard replaces the standard 3/4″+ threaded vented oil fill cap on your hydraulic reservoir with an adjustable low-level float switch. Set the float to the minimum oil level your operation tolerates. If oil drops below that line — a hose lets go, a fitting weeps overnight, a cylinder seal fails — the float falls, the circuit opens, and your pump stops. The leak stops with it.

Oil Guard — drop-in replacement for a vented hydraulic reservoir fill cap

The math: one leak it stops pays for 50+ units

Replacement oil (30-gal reservoir)
$720
Run-dry pump damage (typical)
$1,500 – $4,000
EPA-reportable spill cleanup
$5,000 – $50,000+
Lost route / facility downtime

$500 – $5,000+

Total exposure per spill incident
$7,720 – $60,000+
Total exposure per spill incident
$159 / unit

The asymmetry is the point.

Your worst day without Oil Guard costs five figures and a call to the state environmental office. Your worst day with it costs a service call, a few gallons of oil, and ten minutes to reset.

How It Works

1

Unscrew

Remove your existing 3/4″+ threaded vented oil fill cap from the reservoir.

2

Thread In & Set

Install the Oil Guard in the same port. Slide the float collar to your minimum-acceptable oil level and tighten the bushing.

3

Wire It

Two leads — wire to a PLC digital input (programmed to stop the pump on open) OR in series with the motor-starter relay coil for direct shut-off. The pre-wired quick-disconnect lets you remove the cap to top off oil without re-terminating wires.

Two Ways to Wire It

Option A · PLC Input

Wire both leads to a 24 VDC or 120 VAC PLC digital input. Program the logic to:

  • Stop pump output on contact open
  • Trigger fault alarm / HMI message
  • Log timestamp for maintenance

Best for: new builds, smart compactors, fleet equipment with telemetry.

Option B · Motor-Starter Series

Wire the switch in series with the motor starter’s hold-in / coil circuit (up to 120 VAC). On low oil, the contact opens, the coil drops out, the pump motor stops. No controller required.

Best for: retrofits, legacy compactors, operations without a PLC.

Specifications

Voltage rating
Up to 120 VAC
Contact configuration
Normally-closed dry contact
Trigger
Opens on low-oil float drop
Mounting thread
3/4″ NPT min., larger on request
Bushing
Adjustable, set trigger height
Float rod
304 stainless steel
Cap function
Replaces existing vented fill cap
Coupling
IP-rated quick-disconnect
PLC compatibility
Any digital input, 24 VDC or 120 VAC
Direct control
Series with motor-starter coil

Ordering & Contact

$159

per unit, OEM
qty 10 minimum

Ordering & Contact

  • Adjustable threaded bushing
  • Vented oil fill cap
  • 304 SS float rod + float
  • Pre-wired leads w/ IP-rated coupling

Custom options:

  • Larger thread (1″, 1-1/4″, etc.)
  • Custom rod lengths for deep tanks
  • Dual-level (low + critical)
Lead time: ~2 weeks from PO

Ready to stop the next leak before it stops you?

Email us for OEM pricing, custom configurations, or a sample evaluation unit.

Request a Quote

T.T. Weber Hydraulic · ejb@ttweberhydraulic.com

Old School Craftsmanship · New School Technology