Mobile RV Hydraulic Jack Repair - Florida
Coast to Coast RV Repair provides mobile hydraulic jack repair service on-site at your campground or driveway across Florida - certified technicians, same-week scheduling.
Coast to Coast RV Repair provides mobile hydraulic jack repair service on-site at your campground or driveway across Florida - certified technicians, same-week scheduling.
Certified technicians. $299 service call. Same-week scheduling. Call (866) 887-1199.
How Lippert Hydraulic Jack Cylinders Fail and What the Pressure Numbers Mean
A Lippert PowerGear or HydraLign cylinder is rated to hold 2,200-2,500 PSI of working pressure with a 4:1 safety margin. When internal Buna-N quad-ring seals (P/N 134-0001) degrade - typically after 5-7 years of Florida heat cycling - fluid bypasses the piston and dynamic pressure collapses to under 800 PSI under load. The jack extends partway because static pressure is still present, but cannot sustain load. Scoring on cylinder barrel P/N 140-0889 accelerates this: metal particulate shears the replacement seals within months if the barrel is not measured with a bore gauge before resealing. OEM spec bore diameter is 2.000 inches plus or minus 0.002 inches. Anything over 2.005 inches requires barrel replacement, not seal replacement alone. Jesse Earl carries a Starrett 823 inside bore gauge on every service call to make this measurement on-site. Fluid specification matters as well: Lippert requires Dexron VI ATF - substituting universal hydraulic fluid raises viscosity above the 6.5 cSt (at 100 C) pump tolerance and causes cavitation in the gear-type pump, audible as a whine at 2,800-3,200 RPM motor speed.
Pump Solenoid Diagnosis on Lippert P/N 358890 Manifold
The 358890 manifold houses four directional solenoids (P/N 358878), each rated for 12 VDC at 1.2 amps continuous. A solenoid with coil resistance outside the 9.5-10.5 ohm spec causes intermittent jack operation - the valve shifts partially and bleeds pressure back to tank rather than directing it to the cylinder. Jesse Earl measures coil resistance with a Fluke 87V in ohms mode at ambient temperature: readings below 8 ohms indicate a shorted coil; readings above 12 ohms indicate an open winding. Both conditions require solenoid replacement rather than cleaning. Manifold body contamination - black varnish deposits from oxidized ATF - is cleaned with a parts washer and aerosol carburetor cleaner applied through the solenoid port before the new valve is installed. Once the solenoid coil resistance is confirmed out of spec and the solenoid is replaced, the manifold is purged of contamination by cycling each jack through 3 full extension-retraction strokes before the access cover is reinstalled. This flushing action carries any residual varnish particles to the reservoir where the filter captures them, preventing re-contamination of the new solenoid valve within the first few operating hours.
Also see: Leveling & Jacks Services
This page covers hydraulic jack repair specifically. For the full range of leveling & jacks services we offer, visit our Leveling & Jacks service overview.
Case Study: Hydraulic Jack Repair Repair
RV: 2021 Newmar King Aire 4569 • Location: Naples Motorcoach Resort, Site 27 • City:
Symptom: Front driver-side hydraulic jack extended 4 inches then stopped; pump motor audible but chassis did not rise further; overnight fluid puddle 8 inches in diameter under the jack pad
Diagnosis: Jesse Earl connected a Hydro-Force 0-3,000 PSI glycerin gauge to the Schroeder test port on the Lippert 358890 pump manifold. Static line pressure read 2,480 PSI (within spec), but dynamic pressure at the front driver cylinder dropped to 610 PSI within 3 seconds of extension - confirming internal seal bypass in cylinder barrel P/N 140-0889. Fluid sample pulled via syringe showed metal particulate above 50 microns, indicating cylinder wall scoring.
Outcome: Dynamic pressure restored to 2,410 PSI; all four jacks extended and retracted 3 full cycles without pressure drop; no fluid weep at 24-hour follow-up photo sent to customer
Time on-site: • Total cost: • Dealer alternative:
Hydraulic Leveling Jack Systems - Component Comparison
| Brand/System | Cylinder Working Pressure | Pump Model | Seal Material | Fluid Spec | Typical Seal Life (FL Climate) |
|---|---|---|---|---|---|
| Lippert PowerGear | 2,500 PSI | P/N 358890 gear pump | Buna-N quad-ring | Dexron VI ATF | 5-7 years |
| HWH AP39279 | 2,200 PSI | AP28952 piston pump | Viton O-ring | HWH Hydraulic Oil H-1 | 6-9 years |
| Atwood Levelegs | 1,800 PSI | AT91393 gear pump | Buna-N O-ring | Dexron III ATF | 4-6 years |
| Equalizer Systems | 2,000 PSI | ES-5051 gear pump | Buna-N quad-ring | Dexron VI ATF | 5-7 years |
Signs You Need Hydraulic Jack Repair
- ✓Measure static line pressure at Schroeder test port (spec: 2,200-2,500 PSI depending on system)
- ✓Measure dynamic cylinder pressure under load (must hold within 10% of static)
- ✓Pull fluid sample and inspect for metal particulate or dark varnish discoloration
- ✓Measure cylinder bore diameter with bore gauge (Lippert spec: 2.000 in +/- 0.002 in)
- ✓Test each directional solenoid coil resistance (Lippert spec: 9.5-10.5 ohms)
- ✓Inspect jack pad for cracks and secure pad-to-ram bolt torque (spec: 35 ft-lb)
- ✓Cycle all jacks 3 full strokes after repair and measure level with digital inclinometer
- ✓Check fluid level in reservoir (Lippert spec: 7/8 full with all jacks retracted)
Hydraulic Jack Repair - Pricing
Typical price range: $285 - $950
All calls start with a $299 service-call fee that covers the technician's trip to your location and the first hour of diagnosis. That $299 applies toward any repair you authorize - it is not an additional charge on top of the repair. Pricing shown is a national average range; your exact quote is provided in writing on-site before any work begins.
Hydraulic Jack Repair - Common Questions
Straight answers from our hydraulic jack repair service call log.
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More Leveling & Jacks Services
Other specialized repairs under leveling & jacks - all done at your location, no tow required.
Where We Provide Hydraulic Jack Repair in Florida
Coast to Coast RV Repair runs hydraulic jack repair jobs across these cities. Click your closest one for local-specific info, response times, and campground coverage.