Danfoss S42 P Installation guide

Brand: Danfoss

Model: S42 P

Type: Installation guide

Danfoss S42 P is a versatile and powerful control system designed to provide precise and reliable operation of machinery and equipment. Its advanced features include:

Proportional control for smooth and accurate movement
Load sensing for efficient and responsive performance
Built-in pressure relief valve for protection against overloads
Compact and modular design for easy installation and maintenance

With its wide range of capabilities, Danfoss S42 P is ideal for a variety of applications, including:

Construction equipment
Agricultural machinery
Material handling equipment
Forestry equipment

Danfoss S42 P is a versatile and powerful control system designed to provide precise and reliable operation of machinery and equipment. Its advanced features include:

Proportional control for smooth and accurate movement
Load sensing for efficient and responsive performance
Built-in pressure relief valve for protection against overloads
Compact and modular design for easy installation and maintenance

With its wide range of capabilities, Danfoss S42 P is ideal for a variety of applications, including:

Construction equipment
Agricultural machinery
Material handling equipment
Forestry equipment

PURPOSE:

This bulletin is intended to give instructions for replacement of the spring in the control on a tandem

Series 42.

PARTS REQUIRED:

This procedure requires the following parts:

TOOLS REQUIRED:

This procedure requires the following tools:

• Small Snap Ring Pliers

• Torex Wrench TORX T30

• Allen Wrench,

/16"

• Flat Tipped Screw Driver

• Socket

• Hammer

•

/2" Socket

/8 " Drive

• Torque Wrench,

/4" or

/8" Drives

• O-Ring Pick (to remove O-ring from tube)

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Service Kit Instructions

Series 42

Tandem spring replacement

Tilting the ROPS Canopy Forward

You can tilt the operators compartment with the loader lift

arms in either the raised or the lowered position. When the

loader arms are in the raised position, unobstructed access

to the engine, hydrostatic pumps and motors and control

linkage is provided. With the loader arms in the lowered

position, the loader arm lubrication points are accessible.

Note:

The attachment must be removed before the loader

arms are raised.

Engaging the Loader Lift Arm Lock Pin - 85XT & 95XT

1. While sitting in the operators seat, with the seat bar

down, start the engine and roll the loader bucket all

the way back.

2. Raise the loader lift arms to full height.

3. Engage the loader lift arm lock pump control lever

located in the right rear corner of the operators

compartment.

4. To engage the loader arm lock pin, move the lock pin

control lever toward the center of the machine.

5. Lower the loader lift arms until the loader lift arm link

rests against the lock pin.

Fig. 3 Loader Lift Arm Lock Pin

Fig. 1 Loader Lift Arm Decal

Fig. 4 Loader Lift Arm Lock Pin Engaged

Fig. 2 Loader Lift Arm Lock Pin

Engaging the Loader Lift Arm Lock Pin - 90XT

1. Lower the loader lift arms to the ground and stop the

engine.

2. Remove the support strut storage pin.

3. Start the engine and raise the loader lift arms until the

support strut is on the lift cylinder rod.

4. Lower the loader lift arms until the support strut is

against the cylinder.

5. Install the support strut storage pin.

Cab Tilted with Loader Arms Raised

1. Disengage the operator's compartment lock pins by

pulling the compartment lock levers (1) forward.

2. Tilt the operator's seat forward.

Fig. 1 Operator's Compartment Lock Levers

3. Tilt the cab forward.

PROCEDURE:

1. Tilt cab per procedure in Section 6000 in CASE

Service Manual.

2. Clean pump area of machine.

3. Install a vacuum pump on the hydraulic reservoir.

4. The electrical connections must be removed from

both controllers, also the brake hose and loader

valve hose must be removed from the rear control-

ler.

Fig. 1 Marking the control handle.

Fig. 2 Removing the nut, star washer, and

control handle.

Fig. 3 Removing the plugs.

Note: The pump closest to the engine is referred to as

the rear pump and the pump closest to the auxil-

iary pump is referred to the front pump.

5. Mark the orientation of the control handle to the

pump controller on both the front and rear pump

controllers.

6. Remove the two control handles. This includes the

nut, star washer, and handle.

7. Remove the plugs and note location of summing

link pins in cam slots. This information will be

used during reassembly to ensure correct assem-

bly of the control valves/internal linkages.

On 85 XT, it is necessary to remove the hose from

the gear pump that is over the control valves.

8. Remove all control valve bolts (14 total, 7 bolts in

each controller).

Fig. 4 Removing the bolts.

9. Lift oﬀ both controllers (as shown in picture) and

then separate so that one controller has the tube

connected and the other doesn't.

Fig. 5 Removing the controls.

10. Discard controller gaskets and thoroughly clean the

gasket area.

Fig. 6 Removing and discarding gaskets.

11. Remove and discard snap ring and washer oﬀ of

one controller.

Fig. 7 Removing and Discarding Snap Ring.

12. Remove cam by pushing on the top side of the

controller with your hand. Check the cam shaft and

make sure it is clean.

Fig. 8 Removing the cam.

13. Remove cam spring.

Fig. 9 Removing the cam spring.

14. Remove seal (a ﬂat tip screw driver can be used,

being careful to not damage bore) and thoroughly

clean the seal area before replacing it with the new

one. Using a socket tap the seal down until it is in

it's seat being careful not to damage seal.

Fig. 10 Replacing the Seal.

15. Install new cam spring by putting both prongs on

the right side of the metal post, as shown in ﬁgure

11. Then using a ﬂat tipped screw driver move the

top prong of the spring over the post.

Fig. 11 Placing the spring properly.

Fig. 12 Moving the top prong over the post.

16. Lube cam shaft and seal with clean hydraulic oil,

then install cam shaft being careful to not damage

the seal.

NOTE: Cam shaft leg (1) goes between spring legs and

cam shaft pin (2) has to be in the yoke.

Fig. 13 Installing the cam in the proper

position.

17. Install new washer and snap ring. Check to make

sure the snap ring is properly installed. Do not open

up snap ring further than necessary or the snap ring

could be ruined.

Fig. 14 Installing the new snap ring.

18. Repeat steps 11 through 17 on the other controller.

19. Before installing new gaskets, check to make sure

gasket area is clean.

Fig. 15 Installing new controller gaskets.

20. In order to install the controller without the tube,

clean the bottom of the controller. Slowly lower the

controller down on to the pump and insure that the

summing link pin is in the cam slot. You may need

to align the ﬂat spot on the control spool in the

pump housing to the yoke on the linkage and push

into position while lowering the controller. Install 7

bolts loose enough so controller can be moved

around for ease of installing the other controller.

Fig. 16 Installing the controller without the

tube.

Summing

link pin

MUST enter

the slot in

the control

cam!

Fig. 17 Aligning pin in the controller.

Plug for

Visual

Inspection

Control

Retaining

Screws

Nut

Lock Washer

MDC Handle

Hold summing link

(and control spool)

in position

Control

Gasket

21. Remove the tube from the controller and remove

the O-rings. Clean the O-ring area before replacing

the O-rings. Lube O-rings with clean oil before

installing one end into the controller.

Fig. 18 Removing the O-ring.

Fig. 19 Replacing the O-Ring with a new one.

22. In order to install the controller with the tube, clean

the bottom of the controller and the hole where the

tube will be inserted. First align the tube with the

hole on the controller that is on the pump. Then

situate the controller on the pump in the same

manner as before making sure the summing link

pin is in the slot in the control cam. Push the

controllers together until the tube is completely

connected. It will then be necessary to realign the

bolt holes on the controller.

Fig. 20 Aligning the tube with the hole on the

controller.

Fig. 21 Positioning the controller.

Fig. 22 Pushing the controllers together until

the tube is completely connected.

Note: Make sure the summing link pin is in the cam slot

and both controllers are centered on bolts side to

side and back to front. Check to ensure summing

link pins are able to move freely in both controllers,

Figure 23. Also, check that the summing link pins

are located as close as possible to the position

they were in, prior to the controllers being removed

in step 7.The valve body can be repositioned to

achieve this.

Fig. 23 Checking the cam.

23. Tighten control valve bolts using the order shown

in Figure 24. Torque to 11-13 ft•lbs.

24. Install plugs and tighten. Torque to 8-10 ft•lbs.

Fig. 25 Installing the plugs.

Fig. 24 Bolt tightening sequence.

25. Install control handles making sure that the marks

line up together. Put on the star washer and nut.

Torque the nut to 9-11 ft•lbs.

27. Remove vacuum pump.

28. Start machine and check for leaks.

29. Lower cab and check machine tracking and make

adjustments as required. Refer to the Case Service

Manual.

30. If machine creeps in Forward or Reverse follow the

procedure for "Hydraulic Neutral Adjustment" on the

next page or in the Case Service Manual.

Fig. 26 Installing the control handles and

making sure to align the marks.

Note: A quick check to ensure the pump control handles

are reinstalled correctly is to observe the position-

ing of the operator control levers in the cab. These

levers should align across from each other. If one

control lever is further forward or rearward of the

other, reinstall the control handles on the pump.

26. Reconnect the two hoses to the "T" ﬁtting on the

rear control valve. Reconnect the electrical harness

to the NOR solenoid and back alarm switchs.

On the 85 XT, reconnect the hose between the

loader valve and gear pump.

Pump Adjustments

Hydraulic Neutral Adjustment

The hydrostatic pump is controlled with a hydraulic servo

control valve that uses oil from the charge pump to move the

servo piston. This valve is held in the centered neutral

position by the displacement control assembly. In the

neutral position, the charge pump oil is supplied to both ends

of the servo piston. To prevent the machine from moving

with the control levers in neutral, the hydraulic servo control

valve must be properly adjusted. Use the following proce-

dure to adjust the hydraulic servo control valve:

1. Raise and securely block the unit oﬀ the ground.

2. Disconnect the connector from the Neutral Override

Solenoid on the hydrostatic pump. The connector

must be removed.

3. Connect a jumper wire form the Neutral Override

Solenoid terminal (3) to ground, as shown.

4. Connect the opposite terminal of the Neutral Override

Solenoid to a 12 volt power source (2).

5. Start and run the engine at full throttle.

6. Loosen the lock nut for the servo control neutral

adjusting screw. Loosen the jam nut and use a

wrench to rotate the neutral adjusting screw in one

direction until the tires just begin to rotate in one

direction and note the position of the screw. Rotate

the neutral adjusting screw in the opposite direction

until the tires just beginning to rotate in opposite

direction and note the position of the screw. Repeat

the above steps to assure that the proper adjusting

screw position was noted. Center the neutral adjust-

ing screw between the marks and tighten the jam nut.

Securely hold the adjusting screw in position when

tightening the jam nut to prevent movement.

7. After the neutral adjusting screw has been secured in

position, gradually move the pump control lever away

from the centered position in both directions. The

servo control neutral adjusting screw is properly

adjusted when an even amount of lever travel is

required to begin the tire rotation in both directions.

8. Stop the engine.

9. Remove the jumper wires and reconnect the neutral

override solenoid connector.

NOTE:

If the other drive requires adjustment, repeat steps

through 7 for that pump.

1. Neutral Override Solenoid Connection

2. 12 Volt Pover Source

3. Ground

1. Control Neutral Adjustment

Danfoss S42 P Installation guide

Brand: Danfoss

Model: S42 P

Type: Installation guide

Danfoss S42 P is a versatile and powerful control system designed to provide precise and reliable operation of machinery and equipment. Its advanced features include: