Pre-Shift Inspection Findings on a 36 m Boom Pump
During a pre-shift walkaround on a 36 m truck-mounted boom pump, the operator records six findings. A boom lift-circuit hydraulic hose has a 40 mm chafe through the outer cover, but no wire braid is visible. The swing motor is oil-damp but not dripping. The boom lift cylinder rod has a 0.5 mm deep score extending 80 mm near the wiper seal. The left rear outrigger beam leg pin keeper is missing. The wireless remote emergency-stop function has not been tested since the last job. The main pressure gauge reads zero with the engine off. A 60 m3 foundation pour is scheduled to start in 45 minutes, and the last annual inspection sticker is 11 months old. The contractor is pushing the operator to start pumping and fix items during the pour.
1. Sort the findings into out-of-service, monitor, and normal conditions, and explain the reasoning.
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Out-of-service until corrected: the missing outrigger leg pin keeper, because the pin can walk out under load and cause outrigger collapse; the untested remote emergency stop, because it is a safety function that must be proven before operation; and the scored boom cylinder rod near the wiper seal, because it can tear the seal and create a sudden boom drift or leak. The chafed hose must be evaluated against the manufacturer's hose criteria; if the braid is exposed or the cover damage is deeper than allowed, it is out of service, and if it is only cosmetic it can be sleeved and monitored. The swing motor weep is a monitor item: clean it and watch for drips. The zero gauge with engine off is normal, since no hydraulic pressure is generated.
2. What is the minimum acceptable action before the pour starts?
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The operator should not start the pour with the out-of-service items open. Install the correct keeper or replace the pin, test the remote emergency stop through its full function, and have the scored cylinder rod assessed by a qualified mechanic. If the rod is leaking or the seal is damaged, the pump stays out of service. Inspect the chafed hose under the manufacturer's criteria; replace it if reinforcement is exposed, otherwise protect it from further chafing and record it for monitoring. Clean and observe the swing motor weep. Confirm the annual inspection status before extended operation. The pour should be delayed until these items are cleared, because starting and fixing during the pour puts workers under a boom that may drift or lose outrigger support.
3. How should the inspection be documented and communicated to the contractor?
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Record each finding, the acceptance criterion used, the action taken, and the person who cleared it. Photograph the chafe, the missing keeper, and the cylinder rod score. Note the emergency-stop test result and the date and time. Give the contractor a clear statement: the pump is or is not available for the pour, and which items are monitoring items. If the contractor disagrees, the operator should escalate to the pump owner's supervisor rather than accept verbal pressure. The documentation protects the operator and supports the next inspection, and it gives the contractor a factual basis for delaying the pour or arranging another pump.