Jacobsen 67978 Technical/Repair Manual

2-8 4241262-Rev B
SPECIFICATIONS AND GENERAL INFORMATION
2
Hydraulics
Test Specifications
Front Cutting Units Pump Flow gpm (lpm) 6.8 (25.7) at 3150 rpm
Rear Cutting Units Pump Flow
gpm (lpm) 6.8 (25.7) at 3150 rpm
Lift/Steer Pump Flow
gpm (lpm) 6.8 (25.7) at 3150 rpm
Hydraulic Leakage Percentage Ranges 0–10% = Good
11–20% = Marginal
21% and Beyond = Bad
Lift/Steer Relief Valve Pressure Setting
psi (bar) 1450 ± 10% (100 ± 10%)
Lower Relief Valve Pressure Setting
psi (bar) 450 ± 10% (31 ± 10%)
Reel Motor Forward Relief Valve Pressure Setting
psi (bar) 1167 ± 10% (81 ± 10%)
Reel Motor Reverse Relief Valve Pressure Setting
psi (bar) 1167 ± 10% (81 ± 10%)
Reel Motor Case Drain Rate Less than 1 pint (0.47 L) per minute
Repair Specifications
Gear Pump—Rear Cover-to-Pump Body Bolt Torque lb-ft (N·m) 33 (45)
Gear Pump—Test Fitting Torque
lb-ft (N·m) 32.9 (44.6)
Gear Pump—Tee Fitting Torque
lb-ft (N·m) 55 (74.6)
Gear Pump—Outlet Port Fitting Torque
lb-ft (N·m) 55 (74.6)
Gear Pump—Inlet Port Fitting Torque
lb-ft (N·m) 32.9 (44.6)
Lift Valve—Coil Nut Torque
lb-ft (N·m) 10 (13.5)
Lift Valve—Relief Valve Torque
lb-ft (N·m) 24–26 (32.5–35.3)
Lift Valve—Check Valve Torque
lb-ft (N·m) 19–21 (25.8–28.5)
Lift Valve—Port “P” and Front Side Port “T” Fitting
Torque
lb-ft (N·m) 60 (81.4)
Lift Valve—Port “G” Fitting Torque
lb-ft (N·m) 17 (23)
Lift Valve—Ports “1,” “2,” “3,” “8,” “9,” and “10” Fitting
Torque
lb-ft (N·m) 17 (23)
Lift Valve—Ports “4” and “6” Fitting and One-Way
Restrictor Torque
lb-ft (N·m) 17 (23)
Lift Valve—Rear Side Port “T” Fitting Torque
lb-ft (N·m) 60 (81.4)
Reel Valve—Coil Nut Torque
lb-ft (N·m) 10 (13.5)
Reel Valve—Flow Control Torque
lb-ft (N·m) 24–26 (32.5–35.3)
Reel Valve—Ports “A” and “B” Fitting Torque
lb-ft (N·m) 60 (81.4)
Reel Valve—Port “G” Fitting Torque
lb-ft (N·m) 17 (23)
Reel Valve—Port “P” Elbow Fitting Torque
lb-ft (N·m) 80 (108.5)
Reel Valve—Port “T” Fitting Torque
lb-ft (N·m) 60 (81.4)
Hydraulic Oil Tank Capacity
gal (L) 14 (53)
Center and Rear Lift Cylinder Rod Nut Torque
lb-ft (N·m) 50 (67.8)
Left and Right Front Cylinder Rod Nut Torque
lb-ft (N·m) 50 (67.8)

Jacobsen 67978 Specifications

General

Brand	Jacobsen
Model	67978
Category	Lawn Mower
Language	English