IV-36
HYDRAULIC UNITSGEAR PUMP
INSPECTION AND ADJUSTMENT
Checking Parts
After checking the disassembled parts for dirt or dis-
coloration, clean them with cleaning oil. However,
do not let cleaning oil get on rubber parts. Check
each part for the following points and if there is any
trouble, repair or replace the part.
Housing
The gear pump is made so that the crests of the gear
teeth make light contact with the housing walls as a
means of increasing its efficiency. Therefore, contact
marks can be seen near the suction port in any pump
that has been operated.
It is normal if the depth of the contact marks is
within 0.1 mm. If the depth exceeds the use limit in
the above figure, replace the pump assembly.
Bushing
The ideal situation is for the sliding surfaces to
have no roughness and for the suction side half to
be lustrous. Also, it is satisfactory if strong contact
marks can be seen on the side surface on the suction
side and minute contact marks can be seen on the
discharge side.
• Contact marks can be seen on the sliding surface
of the entire bearing inner diameter and it is so
rough that it looks like it has been clawed.
• There is a large number of scratches around the
circumference of the side surface and it is so
rough that it looks like it has been clawed.
• There are marks from foreign matter biting into
the sliding surface of the bearing inner diameter
and the side surface.
Dirty hydraulic oil is one likely cause of such wear.
In such a case, replace the hydraulic oil and flush out
affected hydraulic circuit completely.
DISCHARGE SIDE
SUCTION SIDE
CONTACT MARKS
T7D157E
T7D158E
A
SUCTION SIDE
DISCHARGE SIDE
CONTACT MARKS
DEPTH OF CONTACT MARKS:
A 0.15mm
T7D159E
DISCHARGE SIDE
SUCTION SIDE
CONTACT MARKS
GEAR SIDE
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