132 HyPrecision 50S/60S/75S Operator Manual 808690
5 – Preventive maintenance
Preventive maintenance
Repair the bleed-down valve
Required parts, tools, and materials
12981 Bleed-down valve II repair kit
12943 Bleed-down valve body
13969 Petroleum-based O-ring lubricant
Full set of standard open-ended wrenches
Adjustable wrench
High-pressure antiseize lubricant such as Blue Goop or AccuGoop
Clean, lint-free towels
Isopropyl alcohol
Do this task when the pump is not running.
1. Use 2 wrenches to remove the O-ring boss adapter from the actuator housing.
2. Replace the SAE O-ring on the O-ring boss adapter.
Put O-ring lubricant on the O-ring.
The SAE O-ring and the piston O-ring look almost the same. The SAE O-ring is thinner than the hydraulic
piston O-ring.
3. Use 2 wrenches to remove the actuator housing from the valve body.
SAE O-ring Hydraulic piston O-ring
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