Bosch Rexroth R978713139 Bladder Rebuild Kit is a 14-gallon Buna‑N bladder rebuild kit for bladder‑type hydraulic accumulators in Bosch Rexroth systems. The kit uses Buna‑N (Buna N) rubber for the bladder and is specified for BSP ports with CE configurations. Bladder‑type accumulators separate gas from hydraulic fluid with an elastic bladder inside the container; during maintenance this rebuild kit restores the barrier, helping reestablish correct pre‑charge pressure and predictable fluid response in industrial hydraulic circuits. The 14‑gal size denotes the nominal capacity of the targeted accumulator, ensuring compatibility with systems designed for a 14‑gallon bladder assembly.
