Grove Published 01-29-2015, Control # 512-01 2-53
TMS700E SERVICE MANUAL HYDRAULIC SYSTEM
smoothly. Proper boom lubrication and wear pad adjustment
is important to permit the boom sections to slide freely. Slow
movement, of the boom may be undetected by the operator
unless a load is suspended for a long period of time.
If a load and the boom is allowed to remain stationary for a
period of time and the ambient temperature is cooler than the
trapped oil temperature, the trapped oil in the cylinders will
cool. The load will lower as the telescope cylinder(s) retracts
allowing the boom to come in. Also, the boom angle will
decrease as the lift cylinder(s) retracts causing an increase
in radius and a decrease in load height.
This situation will also occur in reverse. If a crane is set up in
the morning with cool oil and the daytime ambient
temperature heats the oil, the cylinders will extend in similar
proportions.
The charts (Table 2-4 and Table 2-5) have been prepared to
assist you in determining the approximate amount of
retraction/extension that may be expected from a hydraulic
cylinder as a result of change in the temperature of the
hydraulic oil inside the cylinder. The chart is for dry rod
cylinders. If the cylinder rod is filled with hydraulic oil, the
contraction rate is somewhat greater.
NOTE: Operators and service personnel must be aware
that load movement, as a result of this phenomena,
can be easily mistaken as leaking cylinder seals or
faulty holding valves. If leaking seals or faulty
holding valves are suspected to be the problem,
refer to Service Bulletin 98-036 dealing with testing
telescope cylinders.
Table 2-4 Boom Drift Chart (Cylinder length change in inches)
Table 2-5 Boom Drift Chart (Cylinder length change in millimeters)
Coeff. = 0.00043
(in
3
/in
3
/ °F)
STROKE Temperature Change (°F)
(FT.)102030405060708090100
5 0.260.520.771.031.291.551.812.062.322.58
10 0.52 1.03 1.55 2.06 2.58 3.10 3.61 4.13 4.64 5.16
15 0.77 1.55 2.32 3.10 3.87 4.64 5.42 6.19 6.97 7.74
20 1.03 2.06 3.10 4.13 5.16 6.19 7.22 8.26 9.29 10.32
25 1.29 2.58 3.87 5.16 6.45 7.74 9.03 10.32 11.61 12.90
30 1.55 3.10 4.64 6.19 7.74 9.29 10.84 12.38 13.93 15.48
35 1.81 3.61 5.42 7.22 9.03 10.84 12.64 14.45 16.25 18.06
40 2.06 4.13 6.19 8.26 10.32 12.38 14.45 16.51 18.58 20.64
45 2.32 4.64 6.97 9.29 11.61 13.93 16.25 18.58 20.90 23.22
50 2.58 5.16 7.74 10.32 12.90 15.48 18.06 20.64 23.22 25.80
55 2.84 5.68 8.51 11.35 14.19 17.03 19.87 22.70 25.54 28.38
60 3.10 6.19 9.29 12.38 15.48 18.58 21.67 24.77 27.86 30.96
Length change in inches = Stroke (Ft.) X Temperature Change ( °F) X Coeff. (in
3
/in
3
/ °F) X 12 in/ft
STROKE Temperature Change (°C)
(m) 5 10 15 20 25 30 35 40 45 50 55
1.5 5.81 11.61 17.42 23.22 29.03 34.83 40.64 46.44 52.25 58.05 63.86
3 11.61 23.22 34.83 46.44 58.05 69.66 81.27 92.88 104.49 116.10 127.71
4.5 17.42 34.83 52.25 69.66 87.08 104.49 121.91 139.32 156.74 174.15 191.57
6 23.22 46.44 69.66 92.88 116.10 139.32 162.54 185.76 208.98 232.20 255.42
7.5 29.03 58.05 87.08 116.10 145.13 174.15 203.18 232.20 261.23 290.25 319.28
9 34.83 69.66 104.49 139.32 174.15 208.98 243.81 278.64 313.47 348.30 383.13
10.5 40.64 81.27 121.91 162.54 203.18 243.81 284.45 325.08 365.72 406.35 446.99
12 46.44 92.88 139.32 185.76 232.20 278.64 325.08 371.52 417.96 464.40 510.84
13.5 52.25 104.49 156.74 208.98 261.23 313.47 365.72 417.96 470.21 522.45 574.70
15 58.05 116.10 174.15 232.20 290.25 348.30 406.35 464.40 522.45 580.50 638.55
16.5 63.86 127.71 191.57 255.42 319.28 383.13 446.99 510.84 574.70 638.55 702.41
18 69.66 139.32 208.98 278.64 348.30 417.96 487.62 557.28 626.94 696.60 766.26
Len
th chan
e in mm = Stroke
m
X Temperature Chan
e
°C
X Coeff.
1/ °C
X 1000 mm/m
Reference Only
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