Sakai R2-4, Shop Manual

Page: 72 / 234

4-012
HYDRAULIC SYSTEMS
2-2-3. Propulsion hydraulic motor (R)
Hi
Lo
R2H-2-04004
2 1
11 9 10 8
5 6 3 4
12
7
6 5
2
1
10 4 7
3
Motor circuit diagram
(1) Port B (Reverse) [RMB] : G3/4 (7) Speed change port [RMS] : G1/4
(2) Port A (Forward) [RMA] : G3/4 (8) Shift valve assembly
(3) Drain port [RMD] : G1/2 (9) Motor
(4) High pressure gauge port (For port B) : G1/4 (10) Reduction gear
(5) High pressure gauge port (For port A) : G1/4 (11) Plug : 7/8-14UNF
(6) Parking brake pilot port [RMP] : G1/4 (12) Charge pressure gauge port : G1/8
Motor specifications
Displacement (max.) • : 75.0 cm
3
/rev ( 4.58 cu.in./rev )
(min.) : 28.0 cm
3
/rev ( 1.71 cu.in./rev )
Charge relief valve pressure setting • : 2.4 MPa ( 348 psi )
Brake release pressure • : 1.3 to 1.7 MPa ( 189 to 247 psi )
Allowable motor case pressure • : 0.3 MPa ( 44 psi ) or less
Reduction gear specifications
Reduction ratio • : 1:39.000
Weight • : 193 kg ( 425 lbs. )