Mega MMP4, Maintenance Manual

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MMP4-CAT(T4)-MX-2
26 Feb 2014
SECTION 4
Basic Hydraulics System
4-2
2. Check hydraulic oil level and quality. The level
should be between 80% and 90% of the level
visible in the sight glass and clear.
3. Check hydraulic tank filler cap, breather and bolt
on end cover for security, damage and leaks.
4. Check hydraulic hose fittings and shut off valve,
ensure shut off valve is open.
5. Check tank mounting bolts, ensure the bolts are
tight.
REPAIR
Repair, secure or adjust as required.
HYDRAULIC PUMP
DESCRIPTION
The hydraulic pump is coupled to the flywheel end of
the engine. The hydraulic pump moves the oil
through the system to generate flow and pressure
needed to operate the water pump and boom
cylinders. The pump draws oil from the hydraulic
tank and moves it to the hydraulic control valve
where the control valve directs the oil flow to the
selected components.
INSPECTION
Inspect hydraulic pump, adapter and hosing for
vibrations, unusual noises, security, damage and
leaks.
REPAIR
Repair or replace as required.
WATER PUMP HYDRAULIC DRIVE MOTOR
The hydraulic drive motor is coupled to the water
pump drive shaft inside the water pump. The drive
motor is controlled by the hydraulic control valve,
water pump spool. When the lever is moved to the
ON position the fluid is directed to the drive motor
causing the water pump impeller to rotate, moving
water up the inlet boom.
INSPECTION
1. Check water pump drive motor fittings for
security, damage and leaks.
2. Check for an oily film on water surface
(indications of hydraulic oil leak below the
surface of the water). If water pump is
submerged.
3. Check for oil residue inside of the inlet to the
water pump. If water pump is in the travel
position.
REPAIR
Repair or replace as required.
OPEN
CLOSED