The Kwikee Level Best 3000 is a fully hydraulic leveling system — not electric-over-hydraulic like most modern units. That distinction matters when something fails, because every component in this system is a hydraulic part. This breakdown covers the entire system from the jack cylinders to the control panel, with OEM part numbers and repair context for each subsystem.
Interactive 3D Parts Diagram
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System Overview
The Kwikee Level Best 3000 hydraulic leveling system consists of four main subsystems that work together to extend, retract, and hold the leveling jacks at each corner of the motorhome. Understanding how each subsystem interacts is essential for accurate diagnosis when something fails.
| Subsystem | Function | Key Parts |
|---|---|---|
| Jack Leg Assemblies | Extend and retract to lift and level the coach at each corner | Cylinder assembly, O-ring, reed switch, foot pad bolt, base |
| Pump Assembly | Generates hydraulic pressure and distributes fluid to each jack via solenoid valves | Pump motor, reservoir, 4-way solenoid, 2-way solenoids, pump solenoid |
| Control Panel | Accepts operator input and sends signals to the pump and solenoid valves | Touch pad, PC board, bezel, level sensor, power harness |
| Wire Harness System | Connects the control panel to the pump and each individual jack solenoid | Solenoid harness, control-to-pump harness, emergency retract harness, daisy chain harness |
Jack Leg Assemblies
The Level Best 3000 uses two jack leg configurations depending on the load rating of the coach. The 17K version (part 359275) is the heavy-duty unit rated for 17,000 lb corner weight, while the 10K Atlas version (part 359278) is used on lighter coaches. Both share the same stroke length, port locations, and mounting bolt pattern — they differ in bore diameter and cylinder wall thickness.
Each jack leg assembly is a self-contained hydraulic cylinder with a chrome-plated steel rod, a cast iron or steel cylinder body, and a foot pad at the base. The piston inside the cylinder carries a seal pack that separates the extend and retract chambers. A reed switch mounted to the outside of the cylinder body detects when the piston reaches the fully retracted position.
17K Straight Jack Leg (Part 359275)
| Ref # | OEM Part # | Description | Repair Notes |
|---|---|---|---|
| 0 | 359275 | Level Best Jack Leg Assembly, 17K Straight | Complete assembly — order when cylinder body is cracked or end cap threads are stripped beyond repair |
| 1 | 359294 | O-Ring | Seals the hydraulic port fittings on the cylinder body. Replace any time a fitting is removed |
| 2 | 359281 | Cylinder Assembly, 15-in Straight, 17K | The core hydraulic cylinder — bore, rod, seals, and end caps. Mercury Hydraulics repairs and rebuilds this component |
| 3 | 359285 | Reed Switch — Magnetic Piston Sensor | Signals 'fully retracted' to the control panel. A failed reed switch causes the panel to show the jack as still extended |
| 4 | 359295 | Foot Pad Bolt, 3/4-10 × 1-1/2, Grade 8 | High-strength bolt securing the foot pad to the jack base. Replace if corroded or damaged |
| 5 | 359344 | Base, Jack 501175 | The mounting flange that bolts to the coach frame. Inspect for cracks if the coach has been driven with jacks deployed |
| NS | 359284 | Proximity Switch | Alternative position sensor used on some configurations. Not shown in exploded view — check your specific unit |
10K Straight Atlas Jack Leg (Part 359278)
| Ref # | OEM Part # | Description | Repair Notes |
|---|---|---|---|
| 0 | 359278 | Level Best Jack Leg Assembly, 10K Straight Atlas | Complete assembly for lighter-duty coaches. Same mounting pattern as the 17K version |
| 1 | 359294 | O-Ring | Same port O-ring as the 17K version — shared part |
| 2 | 359282 | Cylinder Assembly, 15-in Straight, 10K | Smaller bore diameter than the 17K cylinder. Mercury Hydraulics repairs and rebuilds this component |
| 3 | 359285 | Reed Switch — Magnetic Piston Sensor | Same reed switch as the 17K version — shared part |
| 4 | 359295 | Foot Pad Bolt, 3/4-10 × 1-1/2, Grade 8 | Same bolt as the 17K version — shared part |
| 5 | 359344 | Base, Jack 501175 | Same base as the 17K version — shared part |
| NS | 359284 | Proximity Switch | Alternative position sensor — check your specific unit |
In most cases, the cylinder assembly (359281 or 359282) is the only component that needs attention — the base, reed switch, and O-rings are typically still serviceable. Mercury Hydraulics repairs the cylinder assembly directly: we re-hone the bore, replace the seal pack, and restore the chrome rod. This costs significantly less than sourcing a complete new jack leg assembly, and the repaired cylinder will outlast a new OEM replacement in most cases.
Pump Assembly (Packard Sub-C Monarch)
The Level Best 3000 pump assembly is a self-contained hydraulic power unit that includes the electric motor, gear pump, fluid reservoir, and a manifold block carrying the solenoid valves for each jack circuit. The complete assembly is part 359280, but most failures involve individual components — particularly the solenoid valves and the pump motor solenoid — rather than the entire pump unit.
The pump uses a Packard connector system for all electrical connections, which is important when sourcing replacement solenoid coils — the coil must have the correct Packard connector type to mate with the existing wiring harness without modification.
| Ref # | OEM Part # | Description | Repair Notes |
|---|---|---|---|
| 1 | 359280 | Hydraulic Pump Assembly, Packard Sub-C Monarch | Complete pump unit. Order only when the pump motor or gear pump is failed — most issues are in the solenoid valves |
| 2 | 906964000 | Solenoid Valve, 4-Way | The main directional valve on the manifold that routes pressure to extend or retract. A failed 4-way valve causes all jacks to fail simultaneously |
| 3 | 359517 | Valve Coil with Packard Connector | The electromagnetic coil that actuates the 4-way valve. Test with a multimeter — should read 20–30 ohms. Replace coil before replacing the entire valve |
| 4 | 364249 | Solenoid Valve & Coil, Level Best (supersedes 359515) | One per jack circuit — controls which jack receives pressure. A failed 2-way valve causes one jack to fail while others work normally. This is the most common pump assembly failure |
| 5 | 365988 | Pump Solenoid, 4-Post (supersedes 906900250) | Energizes the pump motor when the control panel sends an 'extend' or 'retract' command. If the pump doesn't run at all, test this solenoid first |
If one jack fails while the others work normally, the fault is almost always in the 2-way solenoid valve (364249) for that jack circuit, or in the wiring harness connector to that valve. If all jacks fail simultaneously, the fault is in the 4-way directional valve (906964000), the pump solenoid (365988), or the power supply to the pump. The control panel is rarely the cause of a complete system failure.
Control Panels
The Level Best 3000 control panel is the operator interface — it accepts input from the touch pad buttons, reads the level sensor, and sends signals to the pump and solenoid valves. There are two distinct panel families: OEM Winnebago panels (which use a specific connector configuration) and aftermarket replacement panels that fit a wider range of coaches.
The connector type (4-pin vs. 8-pin) and whether the panel includes auto-leveling capability are the two key variables when sourcing a replacement. The 8-pin panels support auto-leveling; the 4-pin "No Auto" versions require manual jack-by-jack operation. Always confirm your connector type before ordering a replacement panel.
OEM Winnebago Control Panels
| OEM Part # | Description | Notes |
|---|---|---|
| 9010000053 | Touch Pad Control, 8-Pin Connector, Winnebago | Full auto-level capability. Most common on late-1990s and early-2000s Winnebago Class A coaches |
| 10100001594 | Touch Pad & Control Kit, 8-Pin (complete kit) | Includes touch pad, PC board, and bezel — order this kit for a complete panel replacement |
| 906900427 | Touch Pad Control, 4-Pin Connector, Winnebago | 4-pin version with auto-level. Verify connector type before ordering |
| 906900406 | Touch Pad Control, 4-Pin, Winnebago, No Auto | Manual operation only — no auto-leveling sequence |
| 1010001592 | Touch Pad & Control Kit, 4-Pin (complete kit) | Complete 4-pin kit with auto-level |
| 1010001589 | Touch Pad & Control Kit, 4-Pin, No Auto | Complete 4-pin kit, manual operation only |
| 1802839 | Touch Pad Only | Touch pad face only — order when the buttons are worn but the PC board is still functional |
| 1602520 | Touch Pad Bezel | Trim bezel around the touch pad |
| 1510000020 | Touch Pad PC Board, 8-Pin | The logic board inside the panel housing. Replace when the panel is unresponsive but the touch pad itself tests OK |
| 1802925 | Touch Pad PC Board, 4-Pin | 4-pin version of the PC board |
| 1510000097 | Power Harness | Connects the control panel to the vehicle power supply. Shared between OEM and aftermarket panels |
| 906900430 | Level Sensor | The inclinometer that tells the panel how far the coach is out of level. A failed level sensor causes erratic auto-leveling behavior |
Aftermarket Control Panels
| OEM Part # | Description | Notes |
|---|---|---|
| 906900401 | Touch Pad Control, Aftermarket | Aftermarket replacement with auto-level. Fits a wider range of coaches than the OEM Winnebago panel |
| 906900404 | Touch Pad Control, Aftermarket, No Auto | Manual operation only — aftermarket version |
| 1802836 | Touch Pad Only | Aftermarket touch pad face |
| 1802837 | Touch Pad Only, No Auto | Aftermarket touch pad face, manual version |
| 1602510 | Touch Pad Bezel | Aftermarket bezel |
| 1010001588 | Touch Pad & Control Kit, No Auto | Complete aftermarket kit, manual operation |
| 1010001590 | Touch Pad & Control Kit | Complete aftermarket kit with auto-level |
| 906915120 | Control Upgrade for Level Best | Upgraded replacement for the older phone-style connector panel (906916000). If your panel uses a phone-style connector, this is the current replacement |
Wire Harnesses
The Level Best 3000 wiring system consists of several distinct harnesses that connect the control panel to the pump assembly and to each individual jack solenoid. Harness failures are more common than most owners expect — corrosion at the Packard connectors, chafing against the chassis, and rodent damage are all frequent causes of intermittent or complete jack failures that have nothing to do with the hydraulic components.
| OEM Part # | Description | When to Replace |
|---|---|---|
| 1809879 | Wire Harness for Solenoids | Connects the control panel to the solenoid valves on the pump manifold. Replace if any individual jack is intermittent and the solenoid valve tests good |
| 1809889 | Wire Harness, Control to Pump, 16 ft | The main trunk harness from the control panel to the pump assembly. Replace if the pump is intermittent or unresponsive despite a good power supply |
| 1809896 | Standard Harness | General-purpose harness used in various configurations. Confirm your specific routing before ordering |
| 1809908 | Emergency Retract Harness | Used to manually retract all jacks when the control panel has failed. Every Level Best 3000 owner should have this harness on board |
| 1809936 | Daisy Chain Harness | Connects multiple jack solenoids in series. Used in configurations where jacks share a common harness run |
Part 1809908 (Emergency Retract Harness) allows you to retract all jacks manually by bypassing the control panel entirely. If your control panel fails while the jacks are extended — a scenario that strands many owners — this harness is the only way to retract the jacks without calling a service truck. It costs less than $50 and takes up almost no storage space. Every Level Best 3000 owner should carry one.
What Mercury Hydraulics Repairs
Mercury Hydraulics is a hydraulic repair and manufacturing shop — not an RV parts retailer. We work on the hydraulic components of the Level Best 3000 system: the jack cylinders, the pump assembly, and the solenoid valves. We do not sell control panels or wire harnesses, but we can help you diagnose whether your problem is hydraulic or electrical before you spend money on parts.
Bore honing, seal replacement, chrome rod repair or replacement. Most repairs completed in 3 business days.
When the original cylinder is beyond repair, we manufacture a direct hydraulic replacement to the same specifications.
Solenoid valve replacement, pump motor service, manifold inspection and cleaning.
Call us before shipping — we can help you determine whether the fault is in the cylinder, the solenoid valve, or the wiring.
Need a Cylinder Repaired?
Call us first to discuss your jacks and get a quote. We ship repaired cylinders back within 3 business days.
(321) 312-0689Request a QuoteWe Repair
7610 Coral Dr
Melbourne, FL 32904