LiftMaster HS670 HS670 GL BOARD Manual - Page 28
Hydraulic System Information, Hydraulic Motors, Hoses - Fittings - Threads, Fluid, Hydraulic Circuit - 1hp
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TROUBLESHOOTING HYDRAULIC SYSTEM INFORMATION FLUID 1. If and when adding fluid, use ONLY hydraulic oil. 2. The tank capacity is: one (1) gallon maximum. 3. To measure the fluid in the tank, it is suggested that a ruler be used like a dip stick. Insert it into the tank until it touches the bottom, then remove. When tank is full, the fluidmark should be around six inches. DO NOT let the fluid level get below 3 to 4 inches. PUMP The pump on the HS670 has a built in relief valve. If the P.S.I. should exceed its factory setting, it will bleed off the excess. The HS670-100 is set at approximately 600 P.S.I. the HS670-200 is set at approximately 1500 P.S.I. 1. Both models have a 4 way, 3 position, dual solenoid activated directional valve. It operates on 24 VDC, with a built-in rectifier on each solenoid. Reference hydraulic circuit. 2. Both models have a bypass valve with handle. When this valve is positioned for manual operation, it will redirect the fluid back into the tank and not through the motors. Reference hydraulic circuit. 3. Both models have a check valve built into the pump. This valve will not allow fluid to go in the wrong direction. Reference hydraulic circuit. HYDRAULIC CIRCUIT CLOSING TOP LOWER HYDRAULIC MOTORS 1. The two hydraulic motors are "ROLLER VANE" type and are machined to be free wheeling. Each motor has a displacement of 12 in3/rev. 2. The speed of each is approximately 55 RPM which equates to a gate speed of approximately 18"/ sec. for classes 3 and 4. For classes 1 and 2, the motor's speed is 37 RPM and gate speed of 12"/sec. 3. The drive wheels are: HS670 1HP (1-1/2" w. x 6" dia.) HS670 2HP (2" w. x 6" dia.). Circumference of both: 18.84" Both have a hardness of approximately 70 "A" shore. HOSES - FITTINGS - THREADS 1. All hoses are: S.A.E. 100 R1, type AT, single wire braid, 3/8" I.D. (Rated working P.S.I. of 2250 and a rated burst P.S.I. of 9000). 2. For information on fittings and threads, see page 29. OPENING TOP LOWER B A A A B B B A A A B B M.V. C1 P R.V. M1 T.F. M1 A.C. Motor Pump P Pump T.F. Tank and Filter M2 Hydraulic Motor D.V. Directional Valve M.V. Manual Valve (Bypass) T.S. Test Station Connect Point R.V. Relief Valve C1 Check Valve M.V. T.S. C1 P R.V. M1 T.F. NOTES: 1. A and B are port destinations. 2. Double arrowheads designate bi-directional. 3. Single arrowhead designates one directional. 28