POWER TAKE OFF & HYDRAULIC PUMP:
1. Mount power take off,and brace hydraulic pump per manufacturers instructions.
2. Ensure that the female spline of power take off is filled with grease.
3. Mount hydraulic pump to P.T.O. using only capscrews provided.
Note : To avoid premature spline wear of the pump and PTO from torsional vibration consult the engine
manufacturer for the correct engine speed (based on application) that will reduce torsional vibration.
SUCTION LINE INSTALLATION GUIDELINES:
Special attention should be given to applications utilizing a double suction or large diameter piping. When
excessive loading or insufficient support of the suction piping exists, reservoir fatigue fractures, loss of oil,
and decreased hose life are likely to occur.
1. For double suction applications, is the weight and length of pipe work (fittings) is excessive? If so,
shorten the piping to reduce vibration and add support brackets to compensate for the added weight.
Additional support brackets should be attached to a common point with the Hyrdrapak so that flexing
of the truck frame and vibration does not induce additional stress on the Hydrapak.
2 On direct coupled double suction piping, if mounting conditions do not accommodate additional
support brackets, consider line mounting a pipe "Y" to fill the need for a double suction. When line
mounting the "Y", a single section of large diameter hose can be fitted to the reservoir suction fitting
leading into the "Y" downstream. Appropriately sized piping can then exit the "Y" and lead into the
pump inlet sections. Always make sure the "Y" pipe is supported and consideration is given to the
remaining points.
MOUNTING HYDRAPAK:
Behind the cab is the preferred mounting method.
Frame rail mount is the secondary choice.
1. Drill 7/16
” dia. holes as shown in Fig.1. Use the capscrews, washers and nuts supplied to mount the Hydrapak.
2. Be sure to allow 4
” of space between radiator and any solid obstruction that will effect air flow into radiator.
3. Radiator must be shielded from rocks and road debris.
HYDRAULIC HOSES & FITTINGS:
1. Do not use thread tape or pipe dope as this will contaminate the hydraulic system.
2. All hoses are customer supplied. Fit all hoses as per separate system drawings provided by Drum.
3. All high pressure hoses must have a working pressure rating equal to or higher than the hydraulic system relief valve
setting.
4. The suction hose must be suitable for 28
”Hg vacuum service.
5. Hoses must have proper support near the Hydrapak to reduce loading from hose and fluid weight.
Unsupported hoses pull on the welded connection fittings of the reservoir and may result in reservoir
stress fractures and shortened hose life.
6. Proper installation of the hoses should include a slight bend in the hoses near the connections. This
allows them to flex, reduce vibration stress and hose shrinkage under load.
7. All hoses should use the largest bend radius possible to reduce pressure drop and loading. Always
follow the hose manufacturer's recommendations for hose duty and bend radius. If an excessively
tight bend is required, consider using a section of rigid pipe such as a street 90 with increased pipe
diameter.
Summary of Contents for MH3 HYDRAPAK
Page 2: ......
