CDM816D WHEEL LOADER
63
Fig. 3-24
Working principle: The structure is shown in Fig. 3-24. The booster pump is a gas pushed oil booster
comprising cylinder and hydraulic master pump. During working, the air entering through air inlet
pushes the push rod piston assembly forward and the push rod pushes the push rod seat assembly.
The oil intake valve seals the oil-filling hole in the hydraulic piston so that a hydraulic pressure is built
up in the hydraulic cylinder and the outputted hydraulic pressure is 10 X90% times as much as the
inputted air pressure. When the air pressure is relieved, under the action of return spring, the oil-filling
hole is opened and the hydraulic oil returns to the oil cup through the oil-filling hole.
E. Structure of brake:
Hydraulic caliper disc brake features great braking torque and high speed. Every axle is equipped with
two auxiliary brakes. Brake consists of inner and outer caliper bodies, piston, brake pad and brake disc
and is fastened to the drive axle housing. Brake disc is fastened to hub, and they make the counter
rotation to the axle housing shaft pipe.
Working principle:
During braking, high pressure brake fluid flows from brake pipe into hydraulic chamber behind piston
through caliper body to drive pistons on both sides to push brake pad to the central position, so that
the rotating brake disc fitted to hub is clamped to produce torque of frictional resistance to brake the
vehicle.
3.
Usage and maintenance of service brake system:
Frequent and proper maintenance of service brake system plays an important role in ensuring braking
performance and improving driving safety.
(1) Frequently check the system for leakage and various connectors and connection parts for
looseness. There shall be no leakage for the air and oil channel systems.
(2) The high-temperature resistant synthetic brake fluid of 719 type(conforming to the standard of
HZY3 product in “GB12981-2003 Brake Fluid of Motor Vehicle”) is preferred. In case of change, only
use vegetable brake fluid and add the brake fluid of new brand after cleaning the original brake fluid.
Timely refill the brake fluid when the level is low. For each filling, a filter bowl shall be used and the
level shall be 20-25mm away from the oil filler. The brake fluid shall not be mixed with mineral oil and
Oil filling port
Oiloutlet
Bleed
screw
Air inlet
Oilinlet
Vacuum air hole
