1. Install seals.
2. Install boots.
Replace seals if any
3. Replace pistons with pits or grooves.
of the described
4. Push pistons through boot and seal. Lubricate
with caster oil, or system fluid-turn piston by
hand until located through seal.
NOTE: improperly located pistons and excessive
Persistant leaks after above repairs.
force (mechanical aids) will result in cut seals.
Check the brake head for cracks (caps-piston bores)
by using "spot check."
For more detailed instructions, see service manual.
175B EMERGENCY BRAKING SYSTEM,
AIR OVER HYDRAULIC
relay, quick release valve and an air tank. Any one
An air over hydraulic, emergency braking system
of these three units or their connecting lines on one
is used on the 1758 tractor shovel. The system pro-
axle can fail and the units on the other axle will still
vides both manual and automatic emergency stop-
apply the brakes.
ping in the event of an air or brake fluid loss.
Schematically the system looks like this:
Each axle has a power cluster (air over hydraulic
brake master cylinder), a combination emergency,