TM 10-3930-671-24 Brakes Service Brake Systems • GPX 25E has manual hydraulic service brake and inching system, with dual suspended foot pedals. • GPX 25E has dual (2) separate brake and inching master cylinders.  Left foot braking and inching, right foot braking only. Service Brakes: GPX 25E - TA18 Transaxle • Brake master cylinder(s), reservoir and lines form closed circuit using standard SAE/DOT 3 ,automotive hydraulic brake fluid. • Drum-and-shoe brakes at drive wheels.  Self adjusting.  Mechanically actuated for parking. TA18 Transaxle • Service & Parking Brakes: 11.81 in.  dia x 2.16 in.  wide (300 mm dia x 55 mm wide) (See transaxle for details). • Master Cylinder - Braking: 0.94 in.  bore x 1.125 in.  stroke (23.88 x 28.58 mm) • Master Cylinder - Inching: 0.75 in.  bore x 1.125 in.  stroke (19.05 x 28.58 mm) Note Have seals for use with hydraulic brake fluid only. • Pedal Travel: Refer to Section 8.4, Brake & Inching System - Type 2. Recommended  Brake Fluid: Heavy-duty hydraulic brake fluid, SAE J1703 spec., or Type DOT, Grade DOT 3 (Grade DOT 5 optional) Brake-Inching Control System • First part of pedal motion moves transmission control valve to regulate release of driving clutch pressure.  Last part of pedal motion releases clutch entirely, and applies service brakes. • Hydraulic inching and braking controlled by left foot pedal.  Right pedal is brake only. Steering System Power Steering System • Hydrostatic power supplied from main hydraulic pump through priority-demand valve to steering gear. • Priority-demand valve gives correct oil flow for steering.  Overflow returned to lift or tilt system. • Steering gear control valve directs oil to 2-way steering cylinder on steer axle. • Steering control acts as pump for emergency manual steering. • Steer Handwheel: 15-inch diameter • Handwheel Tums, lock-to-lock, nominal: GPX  5.2/4.9 (4.314.0 after MAR 87) Relief Pressure Setting *:  1200-1300 psi (8270-8960 kPa) Steer Axle & Steering Cylinder Type 2.  Fabricated weldment body, w/integral double-acting steering cylinder, straight link ball joints.  1) Steering cylinder: Internal steer stops, through-bolts retain gland ends. • Forged knuckles • Straight kingpins in tapered roller bearings • Steer Cylinder:  2.38-inch diameter • GPX  2-piece hub & wheel  750turn angle F-22