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4000 Series Single-Acting Telescopic Cylinder Product Information
 
Square Green Bullet Specifications
Cylinder Tube O.D.  6 1/8"

# of Stages

 3

Largest Moving Stage Diameter

 5"
 Stroke (A)  71.81"

Closed (B)

36.62"

Ext. (C)

108.44"

Base Mount (D)

7.00"

Base Mount (E)

2.06"

Plunger Mount (F)

1.50"

Plunger Mount (G)

2.06"

Gal. Fill

1.8

Gal. Ext.

4.1
 

Dry Weight

153 Pound
 
Square Green Bullet  Lifting Capacities 
Single-Acting Telescopic Cylinders - 4000 Series
  Specific Operating Pressures
Plunger Diameter (in.)
Cross Sectional Area (Sq. In.)
1,500 PSI (lbs.)
1,800 PSI (lbs.)
2,000 PSI (lbs.)
2,500 PSI (lbs.)

2

3.14

4,710

5,672

6,280

7.850

3

7.06

10,590

12,708

14,120

17,650

4

12.56

18,840

22,608

25,120

31,400

5

19.63

29,445

35,334

39,260

49,075

6

28.27

42,405

50,886

56,540

70,675

7

38.48

57,720

69,264

76,960

Consult Factory

8

50.26

75,390

90,468

100,520

Consult Factory

8-1/4

53.50

80,250

96,300

107,000

Consult Factory

9-1/8

65.40

98,100

117,720

130,800

Consult Factory

9-3/4

74.50

111,750

134,100

149,000

Consult Factory

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 Square Green Bullet Model and Serial Number 

MN Single-Acting Telescopic

 The following is an example of Custom Hoists, Inc. model numbers:
Single numbers

Locator

Custom Hoists, Inc. model numbers and serial numbers are either stamped on the O.D. of the cylinder body (manufactured prior to 8-99) or stamped on a metal plate which is welded to the O.D. of the cylinder body (manufactured after 8-99). Using these model numbers will eliminate misunderstandings when placing orders or requesting information.

Model number and serial number stamped in body or on a name plate.

pn-locator

 
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Square Green Bullet Fluid Displacements

Fluid Capacity Factors, sizes 32 thru 86

Cylinder Size

Fill

Extend

Retract

32

.023

.032

.010

42

.032

.043

.013

43

.015

.032

.011

52

.043

.071

.016

53

.025

.057

.014

54

.015

.044

.013

62

.063

.105

.019

63

.036

.087

.018

64

.025

.073

.016

72

.088

.145

.023

73

.050

.125

.021

74

.035

.106

.019

75

.025

.091

.018

82

.111

.192

.026

83

.068

.169

.025

84

.046

.147

.023

85

.033

.128

.021

86

.025

.112

.020


 

Fluid Capacity Factors, sizes 8-1/4 thru 9-3/4

Cylinder Size

Fill

Extend

Retract

8 1/4 3

.061

.150

.029

8 1/4 4

0.49

.134

.027

8 1/4 5

0.37

.115

.024

8 1/4 6

.024

.097

.022

92

.153

.251

.034

93

.073

.222

.031

94

.059

.197

.029

95

.046

.174

.026

96

.033

.155

.024

9 3/4 2

.159

.277

.048

9 3/4 3

.079

.240

.040

9 3/4 4

.065

.210

.035

9 3/4 5

.052

.185

.032

9 3/4 6

.039

.163

.029


 

Telescopic Fluid Displacement Formula

To determine fluid displacement (in gallons) to fill a particular cylinder size, multiply desired cylinder stroke and "fill" factor from below chart. For fully extended displacement, multiply desired cylinder stroke and "extend" factor from below chart.

Example:
Model No. 85-4402-250
Fill: .033 x 250 = 8.3 gal.
Extend: .128 x 250 = 32.0 gal.

Note: Same formula used for single-acting and double-acting telescopic cylinders.
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Square Green Bullet Cylinder Operation  

Extending Cylinder

To Extend: High pressure oil from the pump is directed by the control valve through port (A) to fill the cylinder. Any air in the hydraulic system will be trapped in the end of the cylinder (B) and may be bled off through the bleeder valve (C). It is advisable to bleed air from the cylinder on initial start up and on a weekly basis thereafter.

As the system pressure rises, the oil pushes on the bottom of the largest plunger (F) forcing it to move out. The outside diameter or sealing area of the plunger (D) determines the effective area.

As the plunger extends, the oil trapped between the plunger wall (E) is released through internal port holes in the plunger. When the largest stage is fully extended, the next largest will proceed to extend, etc.

To Retract: A single-acting telescopic cylinder must be retracted by gravity or mechanical means.

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Square Green Bullet Normal Service Items 

Packing, wipers and bushings are considered normal service or replacement items. These items are subject to contamination from external and internal foreign materials, many of which are abrasive in nature, causing abnormal wear or damage to the parts, to the extent replacements are required.

Cylinders may be subject to leaking oil past the seal for various reasons requiring adjustment of the head/packing nuts. This is considered a normal installation and field service adjustment to correct the leakage.

Warning!
Before making adjustments or repairs to the cylinder when mounted in the unit, use strong, heavy, positive supports to hold the body from accidentally lowering which can cause severe injury or death and/or damage to the unit and cylinder. Place control valve in the lower position to insure the pressure is relieved in the cylinder. High pressure can cause severe injury or death and/or damage to the unit and cylinder.

Procedure for adjusting headnuts on telescopic cylinders

A. For leaking cylinders
1. Loosen set screw(s) in headnut of leaking stage(s).

2. Tap headnut lightly around circumference with a hammer.

3. Using a chain wrench, back headnut off one half to one full turn. If plunger turns as you are turning the headnut, the plunger will have to be held, preferably with a strap wrench.

4. Cycle cylinder two or three times to reset vee ring packing.

5.T ighten headnut one half turn farther than it was loosened.

6. Tighten set screw(s).

B. For mis-sequencing cylinders:
1. Loosen set screw in headnut on stage that is sticking.

2. Tap headnut lightly around circumference with a hammer.

3. Using a chain wrench, back off headnut one half turn.

4. Cycle cylinder. If cylinder still mis-stages, turn headnut another half turn.

5. Cycle cylinder. If cylinder still mis-stages, tighten the headnut on the next stage that is extending. If plunger turns as you are turning the headnut, the plunger will have to be held, preferably with a strap wrench.

6. Tighten set screw(s).

C. Bleeding air from Single-Acting Telescopic Cylinders
1. Empty the dump body of any material.

2. Remove the cover plate from the doghouse of the dump body to access the cylinder bleeder valve.

3. Fully extend the cylinder, raising the empty dump bed.

4. Lower the dump bed to within one foot from the frame.

5. Turn the bleeder valve in a counterclockwise direction. This opens the valve and allows the air to escape from the cylinder.

6. When a steady stream of oil comes from the bleeder, turn the valve in a clockwise direction until it is closed.

NOTE: For consistent operation of telescopic cylinders, it is advisable to bleed the air from the cylinder weekly.
If these procedures fail to correct the problem, contact the factory or an authorized service center for further instructions.
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Square Green Bullet Safety Precautions 
WARNING!
Rollover or lateral tilt can cause severe injury or death and/or damage to the unit and cylinder.

  • The hydraulic cylinder will not prevent the dump body or trailer from rollover or lateral tilt. The cylinder is strictly a lifting device and is not a structural member of the unit. Cylinders are not to be used as a means of stabilizing the unit.
  • The hydraulic cylinder mounted in the unit should be free to find its own trajectory line of extension, free of any lateral loading of the plungers. Misalignment of the top or bottom mountings, or mounting pins too tight, may cause scoring of the plungers, leaking, or improper sequencing which could cause the unit to upset.
  • The hydraulic cylinder will not withstand lateral pressure when the unit is leaning. Only activate the cylinder when the tractor and trailer are in a straight line (not jack-knifed). Do not activate the cylinder while on unlevel or soft ground, or during heavy crosswinds. Doing so may cause the unit to upset.
  • Do not activate the cylinder while personnel or equipment are alongside or behind the dump body or trailer.
  • The operator should stay at the controls during the entire dumping operation. If the body starts to lean, the operator should immediately lower the dump body or trailer. It is important to slowly position the cylinder control valve into the hold position to avoid subjecting the cylinder to high pressure.
  • Do not overload the unit. The load must be distributed evenly during loading or unloading to avoid rollover and lateral tilt. Loads stuck while the cylinder is partially or completely extended increases the hazard of rollover and lateral tilt. Lower the dump body or trailer entirely with the cylinder control valve partially open (avoid lowering the dump body or trailer with the cylinder control valve completely open). Then unload the dump body or trailer manually or with an alternative mechanical aid.
WARNING!
Shock pressure can cause severe injury or death and/or damage to the unit and cylinder.

  • Do not use the cylinder to loosen loads stuck in the dump body or trailer. Lower the dump body or trailer entirely with the cylinder control valve partially open (avoid lowering the dump body or trailer with the cylinder control valve completely open). Then unload the dump body or trailer manually or with an alternative mechanical aid.
  • Do not move the truck and jam the brakes while the cylinder is partially or fully extended to loosen loads stuck in the dump body or trailer. Lower the dump body or trailer entirely with the cylinder control valve partially open (avoid lowering the dump body or trailer with the cylinder control valve completely open). Then unload the dump body or trailer manually or with an alternative mechanical aid.
  • Do not move the truck until the dump body or trailer is lowered completely.
WARNING!
Over pressurizing the cylinder can cause severe injury or death and/or damage to the unit and cylinder.
  • Do not operate the cylinder at pressures greater than 2000 P.S.I. unless otherwise approved in writing by Custom Hoists, Inc.
WARNING!
Worn or damaged hydraulic hoses can cause severe injury or death and/or damage to the unit and cylinder.
  • Hydraulic hoses should be checked regularly and replaced if worn out or damaged.
NOTICE!
Do not drive the unit while the P.T.O. or hydraulic pump is engaged.

The hydraulic oil should be checked and changed regularly to avoid contamination leading to internal cylinder damage.

A damp to light film of oil on each plunger indicates a good cylinder operation. A small accumulation of oil may be noticed on the plunger at the head nuts after many cycles. This should not be mistaken for packing leakage.

It is advisable to bleed air from the cylinder weekly to free entrapped air. This will result in a smoother operation.

Grease the pin mountings regularly.
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