Winter takes a toll on compact equipment whether you’ve been running it hard or it’s been sitting idle. Either way, the start of the busy season is where problems surface — and the operators who catch them early avoid the breakdowns that cost real money in May and June.
This is a working checklist for Bobcat compact track loaders, mini excavators, and skid-steer loaders. It assumes you already know your way around daily pre-start checks. The focus here is on what gets missed, what deteriorates over winter, and what’s worth measuring rather than just eyeballing.
Undercarriage: Where the Money Goes
On compact track loaders especially, undercarriage wear is the single biggest maintenance cost over the machine’s life. Spring is the time to get an honest assessment.
Rubber Tracks
Look at the tread depth, but also look at the sidewalls. Irish conditions — wet ground, sharp stone, yard debris — cause sidewall cracking that doesn’t always show up in a quick walk-around. Flex the track by hand where you can and check for delamination between the rubber and the internal cords. If you’re seeing steel cords starting to show, you’re past the point of monitoring — that track needs replacing before it lets go on site.
Check track tension with the machine on level ground. Bobcat’s service manuals give specific sag measurements for each model — typically 12–25 mm of sag at the midpoint between the front idler and the rear sprocket, but this varies. Too tight wears out the drive motor; too loose and the track can derail on a slope. Either way, it’s an expensive problem.
Rollers, Idlers, and Sprockets
Spin each roller by hand and feel for roughness or play in the bearings. A roller that’s starting to seize will chew through a new track in weeks. On the front idler, check for lateral play — anything more than a couple of millimetres suggests the bearing is going. Sprocket teeth should be symmetrical; if they’re starting to hook or show uneven wear on one side, the track tension has likely been off for a while.
Hydraulic System: Hoses, Fluid, and Connections
Hydraulic failures don’t give much warning, and a burst hose on a mini excavator can dump 40–60 litres of oil onto the ground before you get the engine stopped. Spring is the right time to inspect properly.
Hose Inspection
Check every hose you can access — not just visually, but by running a gloved hand along the length. You’re feeling for soft spots, surface cracking, abrasion, and any localised swelling. Pay particular attention to hoses routed near the exhaust or close to moving parts. On mini excavators, the hoses running along the boom and dipper arm take constant flexing and are often the first to fail.
Inspect all fittings for weeping. A fitting that’s damp with oil isn’t a future problem — it’s a current one. Tighten where possible, but if a fitting has been weeping all winter, the O-ring or seat is likely damaged and needs replacement rather than just another quarter-turn.
Fluid Condition
If you haven’t changed the hydraulic oil in the last 12 months or 500 hours (whichever comes first), do it now. At minimum, pull a sample and check the colour. Clean hydraulic oil is a clear amber. If it’s dark, milky, or smells burnt, change it along with all hydraulic filters. Milky fluid means water contamination — which is common after a wet Irish winter — and running contaminated fluid will damage pumps and valve blocks that cost several thousand euro to replace.
Engine and Cooling
Coolant
Check the coolant concentration with a refractometer or test strip. After a winter of top-ups with plain water (it happens), the antifreeze concentration can drop below effective levels. For Irish conditions, you want a minimum of -15°C frost protection. While you’re at it, inspect the radiator fins for mud packing — a pressure washer on a gentle setting will clear them, but go easy. Bent fins reduce cooling efficiency, and you’ll see the temperature gauge creep up once the summer workload picks up.
Air Filtration
Pull the outer air filter element and hold it up to light. If you can’t see light through it, replace it regardless of what the service indicator says. Operating in dusty spring conditions — especially around tillage work or dry site clearance — will load an air filter faster than hour-based service intervals account for. A restricted air filter doesn’t just cost you power; it pulls dust past the seal and into the engine.
Electrical and Attachments
Battery
If the machine has been sitting, the battery may show 12.6V on a multimeter but drop under load. A proper load test tells you whether it’ll start reliably on a cold morning in March. Clean the terminals, check the earth strap for corrosion where it bolts to the frame, and make sure the battery is physically secure — vibration kills batteries as fast as neglect does.
Attachment Mounting
Check the quick-attach plate or mounting interface for wear and cracking. On skid-steer loaders that swap attachments frequently, the locking pins, wedges, and pivot points accumulate play over time. If there’s visible slop when an attachment is mounted, the wear surfaces need inspection. On hydraulic quick-couplers, check that the dust caps are present and that the couplers themselves lock and release cleanly. A coupler that’s stiff to connect has dirt in the mechanism and will score the seals if forced.
A Real-World Example
A contractor in the midlands brought a Bobcat compact track loader in last spring after noticing it felt sluggish. The hydraulic oil turned out to be milky — water had entered through a weeping fitting on the return line over winter. The oil and filters were changed and the fitting replaced. Total cost was a few hundred euro. Left another month, that contaminated oil would have scored the main pump, turning a simple service into a bill north of €3,000.
Put a Structure on It
The temptation with spring maintenance is to do a quick walk-around and call it done. A better approach is to work through each system methodically — undercarriage, hydraulics, engine, electrics, attachments — and note what you find. That record becomes your baseline for the season. When something changes mid-year, you’ll know exactly when it started.
If you’d like a hand assessing your Bobcat compact track loader, mini excavator, or skid-steer loader before the season gets busy, the team at Adare Machinery can help with service checks, parts, or advice on what’s worth addressing now versus later. Get in touch any time.
—FAQ—
How often should I check rubber track tension on a Bobcat compact track loader? Check it weekly during regular use, and always after working in wet, muddy, or rocky conditions. Material packing between the undercarriage components can throw tension off between services.
What does milky hydraulic oil mean? It means water has mixed with the oil, usually through a damaged seal, weeping fitting, or condensation in the tank. Don’t run the machine — change the oil and filters, and find the source of the contamination before putting it back to work.
Can I just top up coolant with water in a pinch? In an emergency, yes, but it dilutes the antifreeze concentration. After any top-up with plain water, test the mixture with a refractometer and correct the ratio before winter or before the concentration drops below -15°C protection.
How do I know if a hydraulic hose needs replacing or just monitoring? If you find surface cracking, soft spots, localised swelling, or abrasion that’s exposing the reinforcement layer, replace it. If the hose looks sound but is past its recommended service life (typically 6 years from manufacture date, stamped on the hose), plan for replacement soon.
What’s the most commonly missed item in spring maintenance? Air filtration. Operators check the service indicator but don’t physically inspect the element. A filter that looks clean from the outside can be loaded on the inside, especially after winter storage where dust and moisture settle into the pleats.
Should I grease the machine more often in spring? Yes — if the machine has been sitting, old grease may have dried out or been displaced. Do a full greasing before the first day of work, and increase the frequency for the first few weeks until you’re confident all pivot points are properly lubricated.
