GMC 4000 Series Service Manual page 214

G M C S E R V I C E M A N U A L
SPECIFICATIONS (CONT.)
VACUUM PUMP SPECIFICATIONS
Model (exc. D LV 4000)............................................................................. 4GA
Model (D LV 4 0 00 ) . .................................................................................... 4GB
Rotation........................................................................................... Clockwise
D riv e .......................................................................................... Belt & Pulley
Front Bearing (B a ll)
I.D ....................................................................................... 0.7872"-0.7874"
0 . D
Rear Bushing (Not Serviced Separately)
1.......................................................................................... D
Front End Plate
Recess for Baffle Plate— Dia.............................................. 2.250"-2.251, /
Recess for Ball Bearing— D ia........................................ 1.8495"-1.8505"
Recess for Oil S e a l— Dia.................................................... 1.498"-1.500"
Recess for Felt W asher— Dia............................................. 1.240M .260"
Shaft Hole— Dia................................................................... 0.826"-0.831"
Rotor Vane
Q uantity...................................................................................................... 3
Length................................................................................... 3.179"-3.181"
W idth..................................................................................... 1.050"-1.070"
T h ic k n e ss..............................................................................0.246"-0.249"
Baffle Plate
Outside D iam eter................................................................ 2.251"-2.253"
Shaft Hole Diam eter........................................................... 0.790"-0.800"
Oil Seal
Outside Dia........................................................................... 1 .5 0 1M .505"
I.D. to fit Shaft Dia. o f.................................................................... 0.781"
T h ic k n e ss............................................................................. 0.703"-0.734"
T y p e ........................................................................................... Double Lip
Housing
Inside Diam eter............................................................... 3.5715"-3.5725"
Length (between machined e n d s)................................... 3.310"-3.315"
Rotor
Length................................................................................... 3.181^-3.182"
M aterial...................................................................................... Aluminum
Rotor Shaft
Length....................................................................................................... 9"
Diam. at Rear B ushin g ................................................... 0.7485"-0.7495"
Diam. at Ball B earin g ..................................................... 0.7867"-0.7872"
HYDRAULIC BRAKES
1.8501"-1.8504"
0.7500"-0.7505"
Sec. 5A
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