Model 6210 Maintenance Manual
Section 7. Component Procedures
Hydraulic Components
Lower When lowering, the load-hold valve (SOL1) and proportional lowering valve (SOL2) open to allow the oil in the pressure lines to return to the oil tank. The lowering speed is regulated by the proportional lowering valve.
Hydraulic System •
Store and handle hydraulic fluid with care to prevent moisture and foreign matter from entering the hydraulic system.
•
Contaminated hydraulic fluid is a major cause of hydraulic system failures. Keep any service equipment, such as containers, funnels, and hand pumps, clean at all times. Cover them when not in use.
•
Dispose of waste fluid correctly.
•
Do not overtighten cable ties used to secure hoses. Hoses expand when in use.
Operating Pressure The operating pressure at rated load is 2400 PSI (165 bar).
Relief Valve The relief valve opens at 3100 PSI (214 bar).
General Guidelines To prolong the life of your Raymond pallet truck, follow these guidelines: •
•
•
•
Keep all fittings and connections tight to prevent leaks. Use care when tightening fittings. Over-tightening can cause damage or distortion. Before you remove any component from the hydraulic system, wash the component and surrounding area with cleaning solvent to prevent foreign matter from entering the system. Cap and plug all openings immediately. Whenever you remove a fitting with a pipe thread, use a sealing compound on the outside of the threads before you reinstall the fitting. (Do not use Teflon® tape.) Make sure all parts are clean. When you install a hose assembly, make sure it is not twisted when the fittings are tightened. Always use two wrenches on a swivel-type fitting—one to hold the fitting and the other to tighten the hose.
•
Keep the hose clamps tight to prevent the hoses from chafing and to avoid leaks.
•
Route hoses so they do not rub on sharp edges.
•
Thoroughly clean up any spilled hydraulic fluid.
Publication: 1146947, Revised: 12 Jan 2017
Hydraulic Unit Torque Specifications The following table provides torque specifications for the hydraulic unit components.
Component
Torque in. lb. (Nm)
Check Valve
216 to 240 in. lb. (24 to 27 Nm)
Load Holding Valve
216 to 240 in. lb. (24 to 27 Nm)
Pressure Compensated Flow Control Valve
216 to 240 in. lb. (24 to 27 Nm)
Low Profile Relief Valve
155 to 175 in. lb. (17.5 to 19.8 Nm)
Coil Retaining Nut
48 to 60 in. lb. (5.4 to 6.8 Nm)
Outlet/Return Port
216 to 240 in. lb. (24 to 27 Nm)
Breather Vent Plug
Finger tight plus 2 to 3 turns with a wrench
Motor to Pump Mounting Bolts
96 to 120 in. lb. (10.8 to 13.5 Nm)
Pump to Reservoir Mounting Clamp Screw
45 to 55 in. lb. (5.1 to 6.2 Nm)
7-71
