SM08-015-1
Page 3
DESCRIPTION
The pump is a gear type pump and can consist of one or
various hydraulically operated functions on the ma-
chine.
more sections. It is used to supply hydraulic oil to the
THEORY OF OPERATION
The hydraulic gear pump consists of two meshed gears
in a closely fitted housing with inlet and outlet ports op-
posite each other. One gear is driven by the power
source and in turn drives the other gear. As the gear
teeth rotate and separate past the inlet port, a partial
vacuum is formed. Oil is forced into the inlet by atmos-
pheric pressure and is carried to the outlet port in pump-
ing chambers formed between the gear teeth and hous-
ing. As the gear teeth mesh at the outlet port, oil is forced
out of the pumping chambers into the outlet port.
MAINTENANCE
REQUIRED TOOLS.
Seal Removal Tool (See Seal Removal Tool
below)
Oil and Grease
The following lists the tools necessary for proper pump
Snap Ring Pliers
maintenance.
Prick Punch
Bushing Installation Tool (See Bushing Installation
Arbor press
Tool below)
Awl
Scale (1/32" or 1/64" graduations)
1-1/2" Dia. Steel Ball
Small Screwdriver
Bearing puller (Owatonna Tool Co. MD-956 or
equivalent
Vise with 6" minimum opening
Bushing Remover Tool (See Bushing Puller below)
Bar for lip seal installation (For 315 use 1-5/8" x
Clean lintless cloths
2" bar, for 330 use 1-3/4" x 2" bar, for 350 use
Debumng Tool (an old file with the cutting teeth
2-1/2" x 2' bar, for 365 use 2-1/2" x 2" bar)
ground off
Special Steel Sleeve (See Special Steel Sleeve
Machinist's Hammer
below)
Soft Hammer
Permatex Aviation Form-A-Gasket No. 3 or
equivalent
Medium Grit Carborundum stone
