Ramming System Rammer Repair98 wc_tx001547gb.fm5.5 Inspecting the Spring SystemSee Graphic: wc_gr001329rmOver time, the constant compression and release of the springpressure can cause the springs to wear out. If the rammer feels to behitting with less force, it is possible that the springs are worn andshould be replaced.A broken spring causes the rammer to jump erratically. This conditionis more noticeable on hard soils. Do not run the rammer if a brokenspring is suspected. Doing so may damage other rammer parts.Replace both the top and the bottom spring sets even if only one set isworn or damaged.5.5.1 Remove the springs from the cylinder and check them for minimumspring free height and maximum spring height difference per the tablebelow. Replace the springs if they do not meet the given specifications.5.5.2 If a spring has broken, inspect the inside of the spring cylinder wall forburrs, gouges, and cracks as follows:• Slide the piston guide inside the cylinder. Check that the pistonguide moves freely but without excessive side play.• Hone the cylinder to remove the ridges and the burrs that werecut into the cylinder wall by the spring movement.• Replace the cylinder if it is badly worn.Minimum spring freeheight (a)Maximum springheight difference (b)BS 500, BS 50 194 mm (7 21/32 in.) 5 mm (3/16 in.)BS 600, BS 60BS 700, BS 70BS 650, BS 65VDS 720, DS 70217 mm (8 9/16 in.) 5 mm (3/16 in.)wc_gr001329rmab
