6679823 Bobcat Hydraulic Quick Coupler Manifold Block - Pressure Relief Upgrade - Connect Under Pressure - Replaces 7246783

Hydraulic Quick Coupler Manifold for Bobcat Skid Steers — Replaces 6679823 / 7246783

This isn't just a replacement manifold. This is an upgrade. The standard Bobcat coupler block traps hydraulic pressure, making it nearly impossible to connect attachments without pounding on the couplers with a hammer. This upgraded manifold features a built-in pressure relief knob — pull the knob, drain the residual pressure, and your couplers slide on with zero effort. Direct bolt-on replacement for Bobcat 6679823 and 7246783.

The Problem

Every Bobcat operator knows this frustration: you park the machine, shut it off, walk to the front to swap attachments, and the hydraulic couplers won't connect. The lines are pressurized — trapped heat from the sun, residual system pressure, or thermal expansion has locked the flat-face couplers shut. You push, you pull, you pound on them with a hammer. You might crack a fitting. You might bust a knuckle. You might spend 20 minutes on something that should take 20 seconds.

The OEM Bobcat manifold block is just a cast iron housing that holds the couplers. It has no way to relieve trapped pressure. This is a fundamental design flaw that Bobcat owners have complained about for decades.

The Upgrade

This manifold block features a user-friendly pressure relief knob built directly into the block. When you need to connect an attachment:

1. Pull the knob — this opens the internal relief valve and drains residual pressure from the coupler ports
2. Connect your couplers — they slide on smoothly with zero resistance
3. Push the knob back in — the relief valve closes and the system is sealed

No hammers. No busted knuckles. No 20-minute wrestling matches. Just pull, connect, and go to work.

Specifications

• Bobcat OEM Part Number: 6679823 (also replaces 7246783)
• Type: Hydraulic Quick Coupler Manifold Block with Pressure Relief
• Body Size: 1/2" (Standard Flow — fits most Bobcat skid steers)
• Couplers: 1/2" ISO 16028 Flat Face
• Input Ports: 3/4" JIC (standard Bobcat fitting)
• Drain Port: 3/8" SAE
• Features: Integrated pressure relief valve, case drain port, direct bolt-on
• Material: High-strength manifold block
• Condition: Brand New

⚠️ Check Your Coupler Size Before Ordering

Bobcat skid steers use two different coupler body sizes depending on the model and flow configuration:

• This listing: 1/2" Body (Standard Flow) — fits the vast majority of Bobcat skid steers and compact track loaders
• 5/8" Body (High Flow) — used on larger machines and "High Flow" configurations (S300, T300, and some larger models with 5/8" flat face couplers). Contact us for the 5/8" version.

How to check: Look at the flat-face couplers on your current manifold block. Standard 1/2" couplers are approximately the size of a nickel. The larger 5/8" couplers are noticeably bigger. If you're unsure, contact us with your Bobcat model and serial number.

Compatible Equipment

This manifold block (1/2" standard flow) fits the following Bobcat machines:

Bobcat Skid-Steer Loaders (Standard Flow)

• Bobcat 763
• Bobcat 773
• Bobcat 863
• Bobcat 873
• Bobcat S130
• Bobcat S150
• Bobcat S160
• Bobcat S175
• Bobcat S185
• Bobcat S205
• Bobcat S220
• Bobcat S250

Bobcat Compact Track Loaders (Standard Flow)

• Bobcat T190
• Bobcat T200
• Bobcat T250
• Bobcat T300 (standard flow — high flow models use 5/8")

⚠️ Machines configured with the "High Flow" hydraulic option may use the larger 5/8" coupler body. The S300, T300 High Flow, and some later S750/S770/T770 models commonly use 5/8" couplers. Always verify your coupler size before ordering.

Why Buy From Trenchwell?

• It's an UPGRADE, Not Just a Replacement: The OEM Bobcat block is a simple cast-iron coupler holder with no pressure relief. This block has an integrated pressure relief knob that solves the #1 complaint of every Bobcat operator. You're not just replacing a broken part — you're making the machine better.
• Save $200+: Bobcat dealers charge $600–$750 for their manifold block — which doesn't even have pressure relief. This upgraded block costs $489 and includes the relief valve. Better part, lower price.
• Stop Destroying Your Fittings: Hammering on pressurized flat-face couplers damages the coupling faces, causes hydraulic leaks, and can crack JIC fittings. The pressure relief knob eliminates all of that damage.
• Direct Bolt-On: Same mounting pattern, same port sizes, same coupler configuration as the OEM block. Remove the old one, bolt on the new one. The only difference is the added pressure relief knob.
• Integrated Case Drain: Built-in 3/8" SAE case drain port for proper hydraulic motor drainage.
• Saves Time on Every Attachment Change: If you swap attachments multiple times a day — brush cutter to grapple to auger — this block pays for itself in the first week from saved labor time alone.

Installation Notes

• Park the machine on level ground, lower all attachments, shut off the engine
• Relieve hydraulic system pressure — cycle controls with engine off
• Disconnect all hydraulic lines from the existing manifold block
• Cap all open lines and fittings immediately to prevent contamination
• Remove the mounting bolts securing the old block to the loader arm
• Install the new manifold block in the same position
• Reconnect all hydraulic lines — verify correct port assignment
• Connect the case drain line to the 3/8" SAE port
• Start the engine and cycle the auxiliary hydraulics slowly
• Check all connections for leaks
• Test the pressure relief knob: pressurize the system, shut off the engine, pull the knob — you should hear a brief hiss as pressure releases
• Connect an attachment to verify smooth coupling engagement

Frequently Asked Questions

Will this fix my problem where I can't connect attachments after the machine sits in the sun?
Yes. That's exactly what this solves. When hydraulic fluid heats up (from the sun, from recent use, or from thermal expansion), it expands and traps pressure in the coupler lines. The standard Bobcat block has no way to release this pressure. This block has a pressure relief knob — pull it, the pressure bleeds off, and your couplers slide right on.

Is this better than the Bobcat OEM block?
Yes. The OEM block is a simple manifold that holds the couplers. This block has all the same functionality PLUS an integrated pressure relief valve. It's a direct upgrade. Bobcat should have designed it this way from the start.

I have a High Flow machine — will this work?
This listing is for the 1/2" standard flow version. High Flow Bobcats (S300, T300 High Flow, and some larger models) use 5/8" flat face couplers and need the larger version. Contact us for 5/8" availability and pricing.

Can I install this myself?
Yes. If you can disconnect and reconnect hydraulic fittings, you can install this. It's a direct bolt-on replacement — same mounting pattern, same ports. No modifications required. Budget about 45 minutes to an hour for a careful installation.

Why is this cheaper than the Bobcat block if it's better?
Bobcat's pricing reflects their dealer network markup, not the manufacturing cost of the block. This manifold is manufactured by a world-class European coupling specialist. We source directly, cutting out the dealer markup. You get a better product at a lower price.