Before each shift.
These checks take ten minutes and catch the failures that stop a rig on the first pull of the day.
- Drawworks brake: test the service brake by lowering a known load; check the emergency brake sets on a simulated overspeed. Listen for grooving on the brake drum.
- Drill line: inspect the outer wires for breaks, corrosion and birdcaging. Check the dead-line anchor and the tight-line tension gauge reads correctly.
- Outrigger interlock: extend all outriggers, confirm the hoist circuit is locked until they are set and level. The interlock is the protection that prevents chassis overturn on soft ground.
- Emergency stop: press the E-stop at the operator's panel and confirm the drawworks drive cuts out.
- Hydraulic oil level: check sight glass; top up with the correct grade for the ambient temperature.
- Mast pins and latches: confirm all lock pins are seated and the latch indicators show closed.
Monthly checks.
Once a month, walk the rig top to bottom. These are the items that degrade over weeks rather than shifts.
- Mast welds: look for cracking at the cord-to-leg joints and the foot pins. NDT is required annually, but a visual pass each month catches cracks early.
- Hydraulic hoses: check for abrasion, bulging and leaking fittings. Replace hoses that rub against the mast or drum.
- Power unit fluids: engine oil, coolant and hydraulic oil levels and condition. Sample the hydraulic oil if the colour is dark or there is visible contamination.
- Wire line sheave grooves: measure groove wear against sheave diameter; worn grooves accelerate line fatigue.
- Clutch and brake linkages: check free travel and adjust if the brake engages late or the clutch slips under load.
- Air and fuel filters: replace according to hours, not calendar, in dusty desert conditions.
Annual inspection and overhaul.
Once a year, take the rig out of service for a full inspection. This is where load-bearing parts are checked to the standard the rig was built to.
- NDT on load-bearing parts: magnetic particle or ultrasonic test on mast legs, drawworks frame and hook. Any defect beyond the allowable limit means the part is replaced, not ground out.
- Brake test: full load-holding and overspeed trip test on both the service and emergency brake.
- Hoist load test: pull to 100% of nominal hook load and hold for five minutes; measure mast deflection against the as-built record.
- Hydraulic system pressure test: check relief valves set to nameplate and accumulator pressure holds overnight.
- Drill line replacement: replace the line on schedule or when the broken-wire count exceeds the field standard, whichever comes first.
Common maintenance mistakes.
- Glazed brake pads from light-load lowering. Lowering an empty block for long periods builds heat without doing useful work, which glazes the pad surface. Cycle the brake with real loads rather than feathering it on empty pulls.
- Over-greasing the sheave bearings. Excess grease seals out the seals and forces lubricant past the retainer. Grease until the purged grease shows clean, then stop.
- Ignoring the dead-line anchor. The anchor is the one point that sees full line tension. Check the bolts and the anchor pin for fretting at each annual inspection.
- Running on degraded hydraulic oil. Dark or varnished hydraulic oil means the anti-wear additives are spent. Sample it; do not top up and forget.
Spare parts to keep on the shelf.
For a workover rig that works remotely, the following spares reduce the downtime of a single failure:
- Drawworks brake pads and springs
- Hydraulic filter elements (return and pressure)
- Fuse and relay set for the control panel
- Wire line clips and thimbles
- Sheave bearing set for the traveling block
- Valve seal kit for the main control manifold
For model-specific maintenance intervals and spare-part cross-references, see the 450HP XJ450 product page or the rig selection guide. When you send an inquiry, state the hours on the clock and the ambient range so the spare-part pack is matched to your duty.